That's a very nice condition - all original - Constellation Deluxe.
For your pricing estimate - yes it is allowed to discuss in this forum.
I would say the watch head only will fetch USD 2500 - 3000. It would worth more if the dial is pie pan.
The mesh bracelet is all gold 18K but not Omega, so it will fetch whatever gold value based on its weight + usd 50-100.
As for service I agree with Kyle. Leave as it is, let the new owner deal with that.
If you have jeweler friend, you can ask him/her to open the caseback to take picture of the movement and caseback. But be very careful since untrained person could easily damaged the caseback when they try to open it.
Best,
H
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