Poljot 3133 Chronograph

The Poljot Calibre 3133 is a 23 jewel, 21,600bph, cam controlled, manual wind chronograph with a coulisse lever system. It has running seconds at the 9 o’clock sub register, minutes elapsed at 3 o’clock and a central sweep seconds counter, it also has a date a 6 o’clock. In the 1970s, the Russian Poljot factory purchased the machinery to produce the 3133 from the Swiss firm Valjoux , at that time they were disposing of the machinery that once produced their chronograph caliber 7734. Poljot then used this to produce the 31mm calibre 3133. A good proportion of the parts of the Poljot 3133 are identical to the Valjoux 7734. The main differences between the two calibres are that the Poljot has all chronograph related gears running in jewels, and the glucydur balance swings in a Poljot developed shock protection system. The balance was modified to a smaller diameter which makes the 3133 run at 21,600bph compared to the 7734’s 18.000bph. This example has an inner 12 hour bezel that can be rotated by the crown on the left of the case and it came in for attention in a non running state.

Poljot 3133 (more…)