A steel cal. 564 Seamaster Chronometer is relatively desirable, definitely moreso than the usual Seamaster. Value really depends on condition and state of originality (meaning dial, most of all; crystals, crowns, and parts like the stem are often replaced over the years, but still should be O.E.M. Omega). If in excellent original condition, it might be worth 1000-1300 I think. It's hard to say more without seeing your watch of course. Is there anyone who might be able to help you in photographing the watch and posting/uploading photos?
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