1951 21 j 10bm model. The only crystal to fit is a CMY 312-6 for an Academy Award Model. The case is all 10k gold filled. The date, case, 21j movement and crystal all suggest it may be an academy, we know there are plain dial varients around. I can find no adverts for this model or hardly any other models the same as. So any ideas? Excellency or Academy are the two front runners at present!
I can understand why they say that. I have found that for many if you fit the crystal recommended, especially if it is an angled one or odd shaped one. It can fit in tight but then over a period the pressure causes it to get a crack which seems interior. I am forever having to shave a tiny bit off of crystals to make them fit snug but not too tight as it causes problems. Is this just a GS thing? As stated I know they used to list almost the exact same crystal with a different number so watchmakers would buy more, for instance there is a hamilton crystal (possibly the sutton) which fits many of the deco Bulova models and vice versa yet they made two different crystals.
2mm is quite a bit to shave off of a crystal to get it to fit, I would say that about 90% of the GS crystals I have used, usually snap right in as long as the grooves are prepped, the other 10% need maybe a 1/2mm filed off for a snap in fit. Rocket on the other hand is a different story...
In reply to 2mm is quite a bit to shave by OldTicker
In reply to where did you get the 2mm by GVP
In reply to 0.2 and 0.1 mm. by bobbee