To celebrate my 1750th post, will examine and compare the ????? (Poljot) 3133 and the Valjoux 7734.
First the technical details of both:
The Poljot 3133 is a 23 jewel, cam controlled, chronograph, lever movement operating at 21,600 bph. It has a running second dial at the 9 o'clock position, a 30 minute counter sub-dial at 3 o'clock, and a sweep second counter mounted centrally along with the timekeeping minute and hour hands. A date display is provided at the 6 o'clock position. The chronograph functions are controlled through two buttons, one (at 2 o'clock) for starting and stopping the chronograph, one (at 4 o'clock) for resetting the second and minute counters. The cam prevents the action of the reset while the chronograph is running.
The 23 jewels are in the following positions:
Balance staff bearings: 4
Impulse jewel: 1
Pallet pivot bearings: 2
Pallet entry and exit jewels: 2
Escape wheel pivot bearings: 2
4th wheel pivot bearings: 2
3rd wheel pivot bearings: 2
2nd (or off set center) wheel pivot bearings: 2
Chronograph second counter wheel, rear bearing: 1
Chronograph minute counter wheel, rear bearing: 1
Minute counter intermediate wheel pivot bearings: 2
Coupling wheel pivot bearings: 2
The Valjoux 7734 is a 17 jewel,cam controlled, chronograph lever movement operating at 18,000 bph. It has a running second dial at the 9 o'clock position, a 30 (or 45) minute counter sub-dial at 3 o'clock, and a sweep second counter mounted centrally along with the timekeeping minute and hour hands. A date display is provided at the 6 o'clock position. The chronograph functions are controlled through two buttons, one (at 2 o'clock) for starting and stopping the chronograph, one (at 4 o'clock) for resetting the second and minute counters. The cam prevents the action of the reset while the chronograph is running.
The 17 jewels are in the following positions:
Balance staff bearings: 4
Impulse jewel: 1
Pallet pivot bearings: 2
Pallet entry and exit jewels: 2
Escape wheel pivot bearings: 2
4th wheel pivot bearings: 2
3rd wheel pivot bearings: 1
2nd (or off set center) wheel pivot bearings: 2
Chronograph second counter wheel, rear bearing: 1
Immediately, we see in first image of each pair the there is a significant difference in the calendar mechanisms. (NOTE- all images will have the 3133 first, unless otherwise noted.) Then both movements were completely disassembled, so each component could be examined and compared. I won't show the disassembly, as it would be rather picture intensive.
Here are all the little bits and pieces.
3133
7734
Let's look at the balance and balance cock first:
We see that the 3133 uses a shim to control the end shake of the balance. This is typical from what I have seen in Russian made movements.
Next the pallet and pallet cock:
The 3133 bridge is shaped to accommodate the banking shoulders machined into the mainplate, the 7734 uses old-fashion banking pins.
At this point we are going to end this post. More comparisons and picture will follow.
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