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I measure the movement as 23.42mm diameter. I guess that'd be called 10.5'''. I don't currently have access to bestfit. I believe this watch is from 1920 or 1921. That predates Bulova's stamping of a symbol to represent year of manufacture and may predate their systematic movement codes. In any case, there is no movement number stamped on it. It was based on a Frey ebauche, but so far knowing that hasn't helped me. -
That makes sense. Thanks. And I will now always remember checking that while I assemble the watch. This is where I’m at now. Here’s is an update on the watch. I haven’t worked on the watch since, but I seems like the watch is now running perfect if he don’t wind it fully up. If he just wind it almost fully up, it doesn’t seem to stop.. and it stops after some time if he wind it fully up. -
Thank you. I have found John Vernon's "Grandfather Clock Maintenance Manual" very helpful in explaining the basics. Unfortunately I have now discovered that the fly has a broken pivot which has rather set me back. I will have to try to source one from somewhere. -
OMG, that means all pins my magnet liked were made of copper. -
Yes, this is on the basis of no epilam. Interestingly, the technical guide calls for using HP1300 instead of grease on a lot of stuff in the keyless works which might indicate an assumption that it had all been treated with epilam. This, exactly I suppose . Literally trying to get a more, or less, viscous oil by mixing two different oils together. Obviously you would imagine using oils from the same 'family' would make them more compatible. Actually, I knew this. Everyone seems to use HP1300 to substitute D5 but Moebius actually recommend their HP oils only for jewelled bearings. If it's a brass bushing D5 is best. Interested what the outcome might be if I used 9020 on the balance/ escape wheel pivots of a typical wristwatch sized movement. The practical consequence of this would be having to service the movement again if it doesn't work but actually the real consequence is that you have bought 2ml of extremely expensive oil that you might not use again.
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