Movement and Performance
At first glance the watch looks like your standard ETA Valjoux 7750 chronograph, however the movement is not the ETA. The Prometheus chronograph instead uses the Shanghai 3LZF2 chronograph movement based off the 7750. From my (limited) research the movements are constructed the same except for the hand fitting dimensions(*). The movement has 30 jewels and beats at 28,800vph with a 36 hour power reserve. The watch can be hand wound by unscrewing the crown and in that unscrewed position turning the crown clockwise. Pulling the crown out to the first position allows for the setting of the day and date: clockwise for the date and counterclockwise for the day. Finally, pulling the crown out to the outermost position will stop the seconds hand (hack) and allow for setting the time.
The chronograph functions exactly the same as the 7750: central seconds hand, minute counter at 12 and hours at 6. The upper pusher will start and stop the chronograph and the lower reset; as mentioned, both pushers screw down to aide in the water resistance feature of the watch. This means, of course, that to keep that rating one would need to keep the crowns screwed in should the watch be submerged, and not unscrew them while in this state. When planning to use you do need to have the crowns completely unscrewed, there is no play near the end of the threads that would allow the chronograph to be engaged without being completely unscrewed. The chronograph starts with a very satisfying “click” when pressing the 2 o’clock pusher; you have no doubt the chronograph has started. If I wasn’t told differently I would have assumed this was a standard, Swiss made Valjoux 7750.
The movement can be seen behind a display back showing the Prometheus text and logo engraved on the rotor. The movement itself has been decorated with Geneva stripes and blue screws. Compared to the movement, the rotor seems a bit under dress, so to speak, and a little plain. Still nice to see the movement inside, something that I never get tired of.
The sample of the watch I received is running fast at a rate of +22 seconds over the course of 24 hours. Clearly not chronometer specs, and I was hoping that I would find it closer than that, however not the worst I’ve seen. I have read of other Prometheus Chronographs running within +/-5 seconds out of the box, and of another that was regulated to run within COSC Chronometer standards. So as with any mechanical there is a range of how well the watch performs. I am hoping that there is a settling in period and the watch comes in slower over time. Timing of watches varies greatly from person to person: some people find anything outside of a 5 second variation unacceptable, others are more lax. I fall into the latter category, personally, and +20 does not bother me as once I learn how my watches run, I set them accordingly. For example, the next time I need to set the time on this watch, I might do so at -20 seconds and let it catch up over the course of the day.
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