3940P, Perpetual Calendar, Third Series, Platinum 5575G calibre P4 developed entirely in-house

calibre P4 developed entirely in-house from Derek Pratt’s P8

The Trio was Vianney Halter’s third model

This particular example

This example is entirely original

The 1832 is a highly technical and robust sports watch

3940P, Perpetual Calendar, Third Series, Platinum 5575G calibre P4 developed entirely in-houseA ref. 3940P from the Third Series with a silver moon and incredible case condition, preserved in its full set. The first Patek Philippe Perpetual Calendar made at scale, the 3940 is serious complication made simple at 36mm. Its revolutionary micro rotor calibre 240Q is a masterpiece of micro engineering, just 3. 75mm thin. Of all 3940 production, platinum is the rarest metal. Only platinum examples preserved the solid caseback only tradition through