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The non-signed crown plus what appears to be the allegedly 14k gold wearing thru to brass on the back of the case makes me have some doubt as to its authenticity, as does the 14k printing, that isn't consistent with the ones I've seen, though I have only minor experience with these sorts of watches.
As @Evitzee says, the tell of the tape would be to see the movement and inside of the caseback on it.
Even if real, value is going to be entirely melt value. You might get ~$75 for the movement from someone desperate for parts, but the case value is all there is. There is ~4g of gold in a case of that size, though if the bracelet is gold too, thats where the value would be. The diamonds are small enough to likely have little value.
I have one almost like this Same case number which I think is a Ross American case.
The movement should be a 650. I have an early thread on it here somewhere. These movements are about as cheap as an Omega movement one will find (well 620 and 480 movements are more abundant.) 640/650 movements are really tricky to work on. I wound up (incorrectly) using rodico to hold the wheels so I could get the plates together. Then broke a bunch of incabloc springs.
I did get a large collection of Women's watch parts to see if I can eventually get better timegrapher results. These though are a real PITA to work with and I have plenty of 55x, 33x and 134x movements to play with first.
I have no intention of ever melting mine though. I used to wear it to the SF opera when I had a box seat. It also visited the Omega factory when I did as one of the 10 omega watches (5 on each wrist.) I still remember on one of the bus rides where one of the other makers looking at the stones remarked 'Holy sh*t those stones are real.' (while small they are of good quality.)
620 base like the 67x and 68x are a lot larger at like 18mm and automatics. These are all based on the 18mm plate. (I see the manual 620 is refed at 17.5mm) The 640 base caliber is 12.5mm that is like 1/2 an inch. A full scale smaller. They are also full plate movements, where the automatics have a stack of bridges and are built with the same quality as a 55x movement.
A 630 movement showed up a few weeks back. I waited too long on it and it sold yesterday. I have another ladies dynamic case I forgot about, although no hands or dial. On the other hand a 68x will fit in the case and I have a few of those... Just need dial hands and a crystal.
so sad/interesting to hear about the 640!
Yeah most of them wound up in the 🔥❤️🔥🔥fiery furnace.🔥❤️🔥🔥
It is hard to keep track of all these ladies calibers. They were a lot of the bread and butter before the quartz crisis. What paied for the R&D. The 470/480 is not the smallest auto. The 455 is 16mm and automatic. I have some rectangular 730 movements what fell into my shoe, and I walked around for the better part of a day till I felt the lump Surprisingly the balances still twitch.
The main problem with these wonderful watches is as noted they were melted down. Most were probably gifts only worn once, which is why they were such the cash cow back in the day.
The makerspace recently got a new 3D printer that is a lot easier to use. I had some decent results using the laser to cut acrylic, but the acrylic is brittle. Did a bit with silicone RTV for mold making. Might be possible to use the laser to make a mold and cast some RTV. Gaskets are an issue why I never totally finish my projects. One of which is a shot injection molding press.