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  1. oddboy

    oddboy Zero to Grail+2998 In Six Months May 13, 2015

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    Hi guys,

    Sniffing around for some wear and tear parts for the parts box and I was wondering if the mainsprings for 321/861/1861 are the same. I notice that the part number is usually designated as: <calibre> 1208 (e.g. 861 1208), so they're all 1208 but is there a difference for the different cals?

    Thanks as always, much appreciated!


    J
     
  2. JohnSteed

    JohnSteed May 13, 2015

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    I didn't think Cal 321 uses same mainspring as Cal 861.

    A great question and I was researching this. Maybe someone more knowledgeable can confirm

    http://www.ofrei.com/page_141.html
     
  3. Archer

    Archer Omega Qualified Watchmaker May 13, 2015

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    320/321 spring is 72203201208

    860/861/865/910/911/1861/1863/1866 etc. spring is 72208601208

    The 860 mainspring is longer than the 320, and also weaker.

    Cheers, Al