Review: I have purchased two watches and have had wonderful experience with both the quality of the watches and the process of selecting them. Marcus is so knowledgeable and patient, that it made me confident in my purchase. Thanks a bunch!  1491J
"Great experience! I accidentally put the wrong delivery address in and the seller was VERY helpful and immediate in his response. The Watch is exactly what I was looking for and beautifully cared for with all proper authentication. Great!"
Thanks, Sandra
Overall Experience with Seller

Communication with Seller
"Seller helped me to navigate an address issue which was my fault."

Description Accuracy


I have enjoyed working with someone whom I could trust regarding this transaction and who offered me a fair price for the watches given their condition.  As you might suspect, I have been researching this sale almost a year before I even contacted you.  Even though some had good online reviews, a few potential buyers simply ghosted me when I sent them photos.  I appreciate your integrity and efforts to preserve these superlatives of mechanical watchmaking.



I want to say what a pleasure it has been doing business with you as I just received my fabulous Cartier Cloche Calandre watch. I had been searching for this little darling for the past several years and was thrilled when I connected with you and learned you had one available.She will be worn and enjoyed for years to come. Thank you Marcus for your help and expertise.
Best regards,



Some feedback from our customers on their purchase and the level of service: 

I first reached out to Marcus Rosner when I stumbled on his amazing website, I was in search for a bracelet for my vintage Patek Philippe 3445 Calatrava wrist watch, and came across one of his listings. Marcus was extremely helpful and generous with his time—explaining to me the minute differences between different bracelet types and how they were fitted to watches back in the 1970’s. Marcus possesses encyclopedic knowledge of Patek Philippe and the Swiss Watch industry. I ended up purchasing an 18k gold bracelet for my watch and enlisting Marcus’s services to clean my watch dial, crystal, and minor lug blemishes. I am proud to call Marcus a friend and would not hesitate to make a future purchase or have my watch movement serviced by Marcus.



Review:  "The watch is of course beautiful. More importantly, I have never worked with a more responsive, cheerful and customer-service focused seller. If it's ever a close call between two sellers of similar items, I would absolutely go with this one! "

  • Model:
  • Review
    Marcus was super helpful in getting a great gift for Christmas. He made the experience feel very personal and he was attentive through the whole process. Highly recommend buying through Marcus, and we will again if we are in the market for another watch.
  • Model:
    523 Drivers
  • Review
    This is the most wonderful, ethical man I have ever worked with. A gem. I encourage ever one to buy from him. Amazing



  • Model:
    Patek 2451R
  • Review
    Working with Marcus was such a pleasure. I was very clearly a first-time buyer interested in a specific piece, and I never once felt vulnerable or like I was being taken advantage of. I was so appreciative of his knowledge and his patience, and felt like I was building a relationship with someone who understood this as an emotional purchase and a significant decision. The humanity in the transaction process is something you hope for but don't often come across. Marcus is a rare seller who was available and and responsive but who didn't rush or push the purchase. I would definitely work with him again and appreciate what a lovely person he is!



5109G on wrist
I purchased my first Patek (a ref. 5109G) from Marcus. The entire experience was an absolute delight! From the moment I reached out (on a weekend) to the follow up after my purchase, Marcus was always prompt and thoughtful in his replies. 
He kindly spent nearly forty-five minutes on our first call and regaled me with stories about the history of Patek Phillipe, his own remarkable journey of selling Patek’s for nearly 50 years and all the while making a novice feel like he was part of that same story. 
As a beginner, I naturally had some follow up questions and, very graciously, he took my calls and pointed me in the right direction (with telephone numbers and names of Patek employees from memory). 
His love for Patek Phillipe and fine timepieces is infectious and I’m grateful for the opportunity to have met. I wouldn’t hesitate to do business with him again; in fact, I look forward to the next opportunity. 
Greg C.


  • Model:
  • Review
    Picked up my watch from Marcus last month. The whole experience was a pleasure. There is something truly enjoyable about interacting with someone who knows so much and has so much passion. Marcus is certainly that someone. His knowledge about Patek is legendary. And his experience from being in the industry for decades is wonderful to hear about. Thanks again Marcus!

  • Model:
    2530 Vintage Tank Style Watch Circa 1952
  • Review
    I cannot say enough about the level of customer service provided by Marcus. A true gentleman, he not only facilitated speedy delivery of my very first Patek Philippe, but when I realized I purchased a watch that was smaller than I expected (my fault for not reading the dimensions), he kindly helped me select another watch and arranged for the exchange. I will most definitely be back when I am next in the market


Model Ref:  570J

Marcus is a Patek lover, connoisseur....and gentleman. He does not treat you as a customer, but as a fellow-traveler watch lover. He introduced me to the world of Patek (both the marketplace and its history) with patient and pleasant hour-long "lectures" on the phone. Then I bought a watch, but for some reason I ended up changing my mind about it. I asked Marcus if I could return it and get another, less expensive one: no problem, he said. It turned out to be a complicated exchange. USPS took about a month to deliver my watch back to him, from New Hampshire to California. Marcus has been helpful throughout offering advice as to what steps I could take with USPS. In short, I had a wonderful experience and I will certainly do business with him again in the future. 
Giovanni G. 

March 25,2022


  • Model: Cartier Tank Chinois

  • Wonderful experience! Marcus responded quickly to my inquiry and patiently answered all my questions - he is very knowledgeable and obviously enjoys talking about his watches! His service is unsurpassed - my watch was shipped immediately upon purchase and arrived exactly as promised. Thank you, Marcus!

January 23,2022


Thank you again. The watch is stunning and is in amazing condition for a vintage watch. It also keeps excellent time. I really appreciate your help in selecting a model. I could not have been more satisfied when I received it. You are the best vintage watch dealer i have ever dealt with. I would finally add that your prices are very fair and reasonable. Until my next watch from you…. Thank you again. David


January 5th, 2022
This is my first Patek watch. I chose it because I was looking for a vintage watch and this one, having been owned by the captain of the USS McGowen, had a wonderful history. Marcus (PatekMonger) was awesome. He showed me many watches, explained the differences, and helped guide me to a very pleasant purchase.

January 5th, 2022

Marcus was a dream to deal with. Walked me through all my questions and indecisiveness to arrive at the perfect piece. Thank you!! Looking forward to my next purchase from him.

January 5th, 2022
I just received this watch, it's actually a gift for a dear friend... he is in love with it... totally stunning watch... Don

January 5th, 2022
When I first saw this 453AR, I thought it might be the Patek that I've been looking for, but I wasn't sure. I contacted Marcus to discuss the watch and he talked with me at length about this watch and several others. At the end of those conversations, I knew for certain that I needed to be the next keeper of this watch. Thanks to Marcus, I now have a much better understanding of the uniqueness of this very special watch brand. Thanks very much Marcus for your time, knowledge, and expertise.

December 4th, 2021

I’ve waited nearly 9 months and finally received my watch today!  Chose to have a friend based in LA pick up the watch from Marcus and carry it back to Singapore but covid derailed our plans and could only receive it today. It was really worth the wait because the watch is simply amazing.  Marcus was super helpful and accommodating throughout the entire process which gave me confidence in making this cross border purchase.


November 27th, 2021

A+ service and product. Everything went smoothly with the transaction and I'm delighted with my watch. Looking forward to enjoying it for many decades.

August 18th, 2021
Bought my second Patek, a Ref. 3923 from Marcus today. Couldn't be happier with my purchase. As always, Marcus was a delight to work and converse with. His depth of experience and knowledge in all things Patek is unparalleled. He showed me several vintage pieces that truly caught my eye. I'm sure one of those will be the subject of my third Patek acquisition.
Thanks again,


August 17th, 2021
I had been searching for a special watch to gift my fiancé for nearly two years and Marcus was absolutely wonderful in helping find the perfect piece. I needed some help in switching the strap as well as a quick delivery in order to make a last-minute trip and Marcus was thoughtful and reliable throughout. Soon after gifting the watch, we called Marcus to see if he could walk us through the care needed and again, he was responsive and patient. His passion, dedication and knowledge is truly unparalleled and I am so grateful for his help. Thank you!

August 16th, 2021
Marcus opened a whole new aperture for me in understanding Patek's history of watchmaking and not only helped me find an incredible piece, but helped me rethink how I approach the brand and collecting with timelessness in mind. His 40+ years of technical knowledge was shared generously through the process and I am also grateful beyond words for his integrity, taste level, sense of humor and passion as a curatorial retailer.

August 12th, 2021
I've been in the market for my first Patek for about 12 months and immediately knew this was the watch for me. Marcus was incredibly helpful throughout the entire process and took the time to speak with me about the history of Patek and the watch. I can't recommend him enough and I'm already eyeing my next purchase!

June 22nd, 2021

I don't often write reviews. Patek Monger has by far the best selection of vintage Patek Philippe watches I've ever come across. Marcus is passionate, knowledgeable and couldn't be more professional. I'm extremely pleased with all the watches he has sold me. Would highly recommend this establishment. Best, Max.

April 24th, 2021 
It was a pleasure dealing with Marcus.  Easy non snobbish conversation for a watch ignorant like myself. One could sense the passion he has for his Patek dealing. Hope I can come back in the not so distant future for another purchase.

April 15th, 2021
Marcus is a real pleasure to work with and the depth of his knowledge of Patek is beyond anyone else's who I have worked with. His passion is contagious and I'm sure I'll be back next year to add to my collection.

April 7th, 2021
I could finally purchase the Patek Philippe Chronograph, which I was always been looking for. The watch is excellent and I am very satisfied.

March 16th, 2021
I live in Los Angeles, and until recently, I had no clue that Patek Monger was in my neck of the woods. I’m so glad I discovered them. I had the pleasure of meeting Marcus, the proprietor of Patek Monger, and we discussed the purchase of a fine Patek Calatrava 5026R. He is a pleasure to speak with, a real gentleman, and a storehouse of knowledge and expert on all things Patek. His collection of Patek watches are truly amazing. His pieces are impeccable, in like-new/mint condition, and as good as the photos are, the watches, when held in your hands, are truly something special that no photo can quite capture. I felt like a kid in a candy store, but this was better. Oh yes. His Pateks for sale are of the condition and quality you would expect and desire to purchase from a serious private collector, not from any pre-owned watch store. And I wanted to buy the whole lot but alas my budget allowed for only one. His prices are quite reasonable when one considers the impeccable condition they are in as though they were locked away in a vault for years. In the end, I walked away with that fine Calatrava with a smile on my face. I look forward to acquiring more pieces in the future. Patek Monger has my highest recommendation. Merci Marcus.

November 2nd, 2020

Marcus is an absolute delight to work with. A true professional and expert in his field. Not only is he extremely knowledgable about his watches, but he is forthcoming with that knowledge and eager to share. I have had several conversations with him, and learn something new each time. As good as the photos on the website are, they still don't do justice to the watch when you finally have it in your hands. Looking forward to the next purchase! Thank you Marcus!


September 1st, 2020
3520D, 3546J, 4223J
Great buying experience Marcus is an absolute pleasure to deal with - superb communicator and depth of knowledge on all matters Patek.
Stephen Daniels

May 23rd, 2020
Marcus was just outstanding and a pleasure to buy a Patek from as his knowledge of the brand, he has been a Patek dealer for 45 yrs, is erudite. We discussed this watch, it’s provenance and all the fun granular details for about 15 minutes. I would highly recommend sans reservation buying again from PatekMonger! Best, Dr Kerr.

September 1st, 2019

Excellent communication and very helpful!

April 3rd, 2019
I am extremely happy with the watch and the interaction with Marcus. He was incredibly responsive on my questions, trustworthy, and very easy to work with. The watch arrived on the promised day, and in the excellent condition that was advertised. I fully recommend PatekMonger and hope to be able to work with him again on future purchases.