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Hamilton 770 shock spring question


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I was servicing an old Hamilton with the 770 movement. A shock spring managed to disappear under mysterious circumstances and I'm now looking for a replacement part.

Which shock spring do I need? I found that Ofrei sells different types but I don't know which one to get, if any.

Here are two photos from my movement. And the third is from the Ofrei website that looks similar.

Thanks!

Screenshot_2016-05-29-19-05-36-01_zps6z0yyczf.jpeg

Screenshot_2016-05-29-19-05-49-01_zpsa6unca7a.jpeg

Screenshot_2016-05-29-19-06-24-01_zpsf2z0wwui.jpeg

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