1. Regarding the movement, you'd need to open it as the 881 and 883 are interchangeable. If I were to guess, it's an 881. 2. Regarding value, it's always a tricky question, if it's "replacement value" you're looking for, i.e. "appraised value" then it will be on the high side of your scale, as that ...

Also, the bridge that says "Jaeger" on the movement is not of a frosted texture, whereas the rest of the movement is. I'm not sure I like that.

No you have a shot of the insides of the case back?

It is genuine, but to my eye, the dial looks refinished. Hard to say for sure w/o looking at it under magnification. No way you're taking a dial's clear coat off and having that end result.

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Take the $4200 and run as fast as you can, maybe even enter the witness protection program.

It looks authentic to me and in an all steel case.

Sure go ahead, please omit details of the shop it's coming from though. We don't want to get into shouting match with them.

Ok, I has asking more about the dial than the mechanicals. Good luck!

Can you post a photo of the back?

It really depends on the model. Some Memovox easily exceed the price of an Omega Constellation.