I had always wanted a birth year Speedy (1977 for me as well, I turn 40 in September). Last year I pulled the trigger on a very poor picture quality Speedmaster Pro on ebay for $2K on a whim. I lucked out and got a very decent -76, which according to "I love my speedmaster" was likely produced in June of '77. This is pretty much the exact same date I had figured by seeing a couple other extracts. Obviously it's not perfect, but I feel pretty confident that it was made in '77.
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