Gentlemen,
please allow me to contribute my own input here.
I do not agree that the 24 million serial number falls always into the 105.012 range. Over the years and in the quest of finding my own grail (145.012-67) i have added over 2.000 photos in my personal Speedmaster archive, concerning nearly all of the existing cal. 321 references.
All i can say is that the oldest 145.012-67 serial number that i have is 240130XX followed by 240678XX and 245328XX and next comes the 25 million photos..."Moonwatch only" seems to agree with the above observation as well.
By the way, i consider the above a quite nice specimen, providing that the price is right IMHO it does really worth a try.
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