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Discussion Starter · #1 ·
I can't seem to find a mainspring for a 6309. Jules Borel seem to run out, so did CousinsUK. Is there any other movement where the mainspring is compatible with my 6309? I read a thread where a ETA 2892 mainspring was used and worked well, even with better amplitude. However, not enough researched was done for practical use.
 

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Looking at part nos. for 6308A, 6309A, 6139A (base cal 6106A) movements, all have same mainspring (401615) and same barrel+arbor nos.(205613). So any of these should do. I got a 401615 from stefan (schillachi61 on ebay UK). Note that 6139B lists mainspring 401616 which is impossible to source, I used a 401615 as barrel & arbor are same and it works ok too.
 
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