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Thread: ????? 3133 versus Valjoux 7734 (with pictures, lots of them)

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  1. #1
    Master lysanderxiii's Avatar
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    ????? 3133 versus Valjoux 7734 (with pictures, lots of them)

    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.

  2. #2
    Journeyman
    Join Date
    Feb 2014
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    Singapore
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    There is so much knowledge in here that I can't understand. More reading!!

  3. #3
    Apprentice rhjj's Avatar
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    Mar 2016
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    Germany
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    Really superb!!

  4. #4
    Great pictures / read.

    Always wondered if the 3133 could be used to replace a defective 7734, shame they are so different.

    Cheers

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