Wittnauer mainspring size..... Help...

Bob Weit

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Dec 30, 2020
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Hello all - my wife has my mother's wrist watch and she nicely asked me to see if I could get it running...... Bottom line, it needs a new mainspring. All I can see on the movement is 5JH and AXA, which I believe is an import mark. The old mainspring, as best I can measure it, is 1.45mm wide and right at 7.5" in length (190.5 mm). I am hoping that the wealth of knowledge on this board can guide this novice to the proper mainspring for this antique. If I can get it running, the wife will be overjoyed and my life will likewise be good..... :). The only "Wittnauer" mainspring I am finding is a "770" part for a 3W movement. As I have no idea if this is a 3W movement, I am hesitant to get that particular spring.

Thanks in advance to all of you - stay safe and well.
Bob
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Last edited:

agemo

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Apr 5, 2011
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