Patek Philippe 3419/1A ; Vintage water resistant stainless steel Calatrava Watch circa 1960

Introduction:
This Patek Philippe 3419/1A Convertible vintage Calatrava watch has a  400 caliber Patek Philippe 3419/1A Stainless Steel Calatrava with Convertible mesh design bracelet.  The watch measures 35mm in diameter water resistant, and fitted with a 12"400 caliber movement #729294 / 2605158.  The watch has a silver white dial, with baton markers and hands in the minimalist design.  Extract certificate on order.

Date & Paperwork: 
The watch was made in 1960,  Additionally, the watch comes with a one year movement guarantee.

Essay:
This model was designed to allow the easy change of the leather bracelet against a metal version by unscrewing a metal ring fixed onto the case back and revealing the lugs, hence its name convertible. The reference 3419 was introduced into the market in 1960, the same year as the anti-magnetic caliber 27-AM 400, an improved version of the 1958 caliber 12'''400, now fitted with a Gyromax balance, gold lever and free sprung self-compensation Breguet overcoil hairspring.

Specifications: 
Reference Number: 3419/1
Year Manufactured: 1960
Case Diameter: 35mm
Movement: Manual