I would guess the following
1) Constellation, pie pan dial and dog leg case, if 18K, then $ 2500 - 3500
2) seamaster, possible 18k dial, with arrowhead markers, if case also 18K, then around $1800 - 2500
Both guesses above are for head only
If the bracelets are also 18K, and if not Omega branded, then value as scrap - ie weight them both and work out scrap gold value
Ps could really do with much better photos to give better advice on these. Both crystals will be plastic, by the way, not sapphire, so can be easily polished by hand
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