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Thanks for the reply Knebo. Nice catch about the bumps under the balance cock. I've seen those on the main plate in other watches but not as was done here. I'll do as you suggested and see what comes of it.
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Difficult to say from these pictures. But here are a few observations. here, it looks as if there is a possibility of the second coil (counting from the outside / the one that is within the regulator pins) could touch the regulator pins as well when the watch is running. See red arrow. That could effectively increase the rate of the watch (shorter effective length of the hairspring). Have a close look with your loupe/microscope when the watch is running. ...but on this picture of yours it almost looks the opposite. Very hard to say. Have you looked from the side to see if the hairspring is flat and not touching anything? Lastly, on this picture, you can see that a previous watchmaker has tried to increase balance endshake by creating bumps in the metal under the balance cock. So you know that the watch has been through some things. Possible that someone has replaced the balance staff or even balance complete (in old watches, this can often lead to timing issues when the hairspring is is a bit shorter that the original or the balance wheel a bit lighter). Either way, you'll learn a lot from this one! Good luck!
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By Terrinecold · Posted
Demagnetized was done. I'll take a look at the hairspring more. At least this doesn't require removing and putting back the damn bridge -
By Latetothegame · Posted
Swiss EB 8800. AND thanks again for your help! In a completely unrelated matter, a friend of mine asked me if I could get his pair of 50 year old political novelty watches running. He had a set, Richard Nixon and Spiro Agnew. The Agnew one was actually a sort of big deal in the early 70s. Interesting story. Anyway, I open them up (two days before getting the Sovereign watch open) and what do I find? Two EB 8800 movements. What a coincidence. None of them needed parts. Just a cleaning and lubrication. They’re all running now. -
By Terrinecold · Posted
Yes to both as far as I can tell. Not sure if I can take a slow-mo video from the microscope camera. I'll try. I can also take one with my phone
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