Also, in the first version, the wheel train bridge is integrated with the barrel bridge, but in v.2, the two bridges are separate to facilitate servicing. For increased robustness, the second generation is 4 mm high, compared to 3.86 mm for v.1. Most obviously v.1 is fitted with an ordinary ETAChron regulator as seen here, while v.2 sports a C-shaped regulator. Several subtle differences exist between v.1 and 2. This particular specimen being reviewed uses the short lived version 1 of the 1904 MC. While not remarkable in any way, this escapement set up is tried and tested and works tremendously well.

The escapement is conventional, featuring a smooth Glucydur balance with a lever that touches its rim to stop its oscillation when the crown is pulled. Compared to the traditional reversers (in ETA calibres for instance), the V-shaped pawl theoretically offers more efficient winding. This winding mechanism is very similar to Seiko’s “Magic Lever”. Sitting on ceramic ball bearings, the rotor winds both barrels are wound bidirectionally thanks to a V-shaped pawl. The 1904 MC is constructed with double barrels that unwind in series for more consistent torque over the 48 hour power reserve. Notably it is the same diameter as the ETA 2892, if slightly thicker, enabling it to be an easy replacement for the 2892. Measuring 11 ½ lignes and 4 mm high, the movement is designed to be reliable, easy to service and suitable for mass production. With the exception of a handful of parts like the balance wheel and hairspring, movement components are made by Cartier, either at La Chaux-de-Fonds or Buttes in the Canton of Neuchâtel, with assembly and testing done at La Chaux-de-Fonds.

Named the 1904 MC for the year Louis Cartier created a wristwatch for pilot Alberto Santos-Dumont, this is the first automatic movement to be made in-house by Cartier.

Cartier calibre 1904