jurisevac@
·Redial the conni, or service the speedy?Redial please.
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Maybe this will help, my big triangle SM300 serial number is only 305 apart from OP's serial number. Mine is not issued, but is original and my freshly acquired Extract of Archives confirms it as a 165.024 Seamaster 300. Suggest OP orders an Extract, should confirm if it's an issued 300, and would remove any doubts and potentially add to value.
I've ordered the archive extract, says will take up to 6 weeks- anyone got experience of how long they generally take?
Noticed an auction at bonhams in September for one that is only 16 numbers away on movement serial number.
https://www.bonhams.com/auctions/23509/lot/203/
If everything verified with list of parts replaced by Omega In Switzerland, $4,800 won't surprise me.