Atlas 618 Thread Dial gear

Yes, as I wrote yesterday, M6-64 is 16 tooth and M6-64A is 32 tooth. I have scans of the original M6-64 drawing and of a 1973 re-draw of the 1946 M6-64A one. When I get them cleaned up, I'll upload them. Unfortunately, whatever change notes were on the original 1946 M6-64A drawing were not copied over to the 1973 redraw. And the redraw only shows applicability to the 3950 and another 4-digit number that I don't recognize. It ignores the fact that for 27 years the 32 tooth gear had been used on the 618 and either the 101.07301 or the 101.21400.
 
This 6" threading handbook is also in the rather rare version of the MOLO where Chapter 7 covers the Atlas 6". Too bad that it doesn't have a print date anywhere in it, as that would date that MOLO version, too. However, we do know that it can't have been printed any earlier than 1946, which is the original date on the 32 tooth threading dial gear drawing. I'll put the booklet in Downloads.
 
Also, the 6" threading handbook almost certainly came out in 1946 or later, after the switch to the 32T gear. Unfortunately, like the earlier similar publications on the 10" and the 12". it is not dated.
 
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