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It's a Seamaster, not a Constellation. That said, all parts look original to me, and in fairly decent condition. The price is a little high, but I think it's reasonable. Not NOS by any means but the case looks fairly sharp.
The face, case and hands seem to be appropriate and in nice condition but the photos aren’t particularly good, and I can’t see if they’ve been edited or not. On the basis that the watch is okay, I’d tick that box if I were buying.
I'd generally take a chance on an Omega 5** movement on the basis that I understand that these are usually straightforward to fix/service if there’s a problem. I can’t see any problems so, another tick.
If the watch is advertised as working well, and/or serviced (particularly if there’s a service receipt from a reputable watchmaker) and if returns/refunds are accepted I’d probably go for it.
The price is high, but not outrageous and so, I’d say that box is ticked too.