Home Forums General Discussion Forum Peseux 40 Balance stem

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      Hi working on 1930s Peseux 40 movement .The balance spring need to be replaced . My question is the 1930s non incaboc balance the same as the one for incaboc from the 1950s.I am new to this game so please be kind.

      Your help would be much appreciated.



        Hey Ben,

        I’m pretty sure that the balance should be the same..just one will have the inca-block shock absorbing system.

        You will want to replace ( swap ) the entire balance, as the hairspring and balance wheel are regulated ( vibrated ) together.

        One think you may encounter is that the donor balance may be a bit different than the one you now have, which could cause some side shake or end shake issues. With older watches it can be a crap shoot


        Best regards,


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