18ct yellow gold Patek Philippe ref. 3440 Calatrava automatic wristwatch. Made 1966

18ct yellow gold Patek Philippe ref. 3440 Calatrava automatic wristwatch. Made 1966The calibre 27 460M (M for Monodate) was an evolution of Patek Philippes first automatic calibre, the 12 600AT, which was fitted to the legendary reference 2526. The calibre 27 460M had received several upgrades, including a Gyromax balance wheel, a ball bearing, and some additional jewels. Over the ensuing years, three series were made with the first fitted with an acrylic crystal, similar to the present watch, the 2nd series made during the late

Reference:  ST 145

SKU: 03204

Dial: Silvered dial featuring applied mirror polished baton hour indices and Dauphine hands with date aperture at 3 o'clock

Several variations of the model exist

Calibre: EWC

3% pure gold

Dial: White dial featuring black printed Roman numeral hour markers with blued steel sword shaped hands

12 hour and 30 minute registers featuring applied yellow gold arrow hour markers and hands

Calibre: 30T2

Model: Oyster Perpetual

Reference: 9706 D2

the Chronostop was designed to be used for short interval timing -- less than one minute -- with a central hand for seconds and a single pusher