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Help with Breitling Big Date 6.75 Movement


kszucs
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Hey all !!! I got a really nice Bentley big date 6.75 rep years ago from Toro. I am not quite sure which movement is in it.. I thought A7750 … but I am second guessing myself now. 
 

The watch stopped working a while back and I have slowly been getting the courage to fix it. 
 

So I took it apart and the escape wheel pivot is broken. I ordered an eta 7750 escape wheel .. but .. the new one has 20 teeth, Old one is a 15 tooth escape wheel. 
 

anyone able to help me figure out which escape wheel to order ? 

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