Get me the serial number on it and ask a dealer to verify it. Also bring it to a AD if you can and they can check it pretty quickly. If you don't have a dealer nearby at least get the numbers and call Omega.
I found this speed master on Facebook. I have not clue if it’s real or not. He wants $1000 he recently cut the price from 3k. The watch does not come with box and papers. Would probably needs a service. The seller seems like a semi decent middle aged man. Any opinions on this.
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