Look on Chrono24 as well, there are refs. from the eighties quite often. However, there are always people mixing up serial number databases and listing Speedmasters from the early nineties as eighties. Those tend to quickly get nervous if you advise them about their mistakes...
I've found my birth year (1985) Speedmaster through C24 : all you need is patience and good saved searches with email alerts. Good luck !
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