What part is missing from this 5AR and what movements have it?

Submitted by xyzzy on January 14, 2021 - 9:20pm
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What part, other than the stem, is missing from the 5AR movement?  And what other movements have an interchangable part?  The 5AR appears to be too new to be in any of the parts lists.

I know what part is missing and the manner in which it became so.  I thought it might be more fun to ask this way.

5AR disassembled

10BZAC Mainspring

Submitted by wdschell on January 10, 2021 - 5:55pm
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Hello All,

I picked up a M1 Bulova at a thrift shop and everything looks really good and is running.  I put it on the timegrapher and the amplitude is only around 200 degrees.  Is that normal for these? I have only fixed a couple of elgin pocket watches up to this point and they had much higher amplitudes.


If it isnt normal do you all know what mainspring would fit this movement?  Thanks

6CAMC hand size

Submitted by xyzzy on December 21, 2020 - 7:22pm
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What would be the hand hole diameter for a 6CAMC movement?

I tried to measure the hands myself.  I get about 1.0 / .63 for the hour and minute.  The second looked bigger when next to a replacement hand that should be a 0.20 mm hole.

I checked the Ranfft Watches database, and they don't have this movement, but all the other Bulova 6 movements with center seconds, 6CAC, 6BKC, etc.. are 1.10 / 0.60 / 0.18.

Looking for a 1976 Computron Power Cell Hatch

Submitted by kratzjoseph60 on December 20, 2020 - 7:56pm
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Hi, I recently acquired a 1976 bulova computron drivers style watch. It has one of the two threaded battery covers on the case back. I'm looking for one or a matching set so I can finish the watch and make it 100%. Unfortunately they aren't the same size as the accutron 214 threaded covers so they have to be from a computron that takes a 228 cell. No one online seems to have any so I was hoping someone here might have spares or a parts watch that they'd be willing to sell.


J. Kratz