PatekMonger is an effort to preserve vintage and discontinued Patek Philippe pieces through a lifetime of experience with the brand and precise restoration from expert watchmakers for current and future generations to enjoy. Today, PatekMonger buys, sells, and services vintage Patek Phillipe, Cartier, and other select watch brands and jewellery. We have been serving Los Angeles and Southern California for 50 years (and now the world!) and continue to build relationships with lifetime customers.


Marcus Rosner founded PatekMonger in 2017 after partially retiring and selling his jewelry store of 42 years in the Westwood Village neighborhood of Los Angeles.  During that tenure, he was an authorized Patek Philippe dealer for all 42 years becoming the longest continuous running Patek Philippe dealer west of the Mississippi River. Today, Marcus focuses on finding watches that time may have forgotten and restores them to their original condition so they can continue to be cherished and passed down by those who appreciate their classic design and craftsmanship.

patek monger

Through lifelong relationships with the most skilled watchmakers and an unmatched index of knowledge for both the history of the Patek Philippe brand and each individual reference, he is proud to maintain one of the largest collections of pre-owned and vintage Patek Philippe timepieces. 



We perform watch repair and restoration for modern and vintage watches. All services are performed by a certified watchmaker.

These factory specifications for service include:

- Complete dis-assembly of watch and movement
- Complete cleaning and examination of all parts
- Proper oiling, reassembly, and regulating using state the art equipment
- Proper seals and new gaskets as necessary with a water test.

Complete restoration of case and bracelets are done upon request.  All services are guaranteed for one year not including accidental damage.

All watches sold through PatekMonger are fully serviced and their authenticity is fully certified and guaranteed.



On May 1st, 1839 two Polish immigrants, Antoni Patek (Businessman) and François Czapek (Watchmaker) joined forces to found "Patek, Czapek & Cie" in Geneva.

In 1844, Patek met the French watchmaker, Jean-Adrien Philippe in Paris where the latter presented his pioneering stem winding and setting system by the crown.

In 1845, when Czapek decided to leave the company and to continue on his own, the company name changed to "Patek & Cie".

Later, in 1851 when Adrien Philippe officially became associated with the company, it was renamed "Patek Philippe & Cie", before changing once more in 1901 to "Ancienne Manufacture d’Horlogerie Patek Philippe & Cie, S.A.".

In 1932, the company was purchased by two brothers, Charles and Jean Stern, owners of a fine dial manufacture in Geneva. Since then, "Patek Philippe S.A." remains a family owned firm.

In 2009 the company presidency was officially transferred from the 3rd to the 4th generation : Thierry Stern became president and his father Philippe Stern, Honorary president.