IMO
@Rman is correct in his assessments regarding the seconds hands. Yes, there are two types of "teardrop" seconds hands for the SM300. And yes they first appeared on the late 14755's and were the long tipped/short fat body type. The short tipped/long slim body type were used onwards from around the transition phase where the -64's subreferences became the non subreference 165024 and 165014's. And yes, more about that in the book to come
@michael e , regarding the short baton minute hand. My guess would be the railmaster 135.004. Hole size for the cal 28x minute hand is almost the same as the cal 55x. Plus 0,15mm if I recall correct. Hard to see that in pictures.
And regarding the flat vs. rounded question, yes, it's also my opinion that any flat ones are later/early service hands.
@michael e , do you have pictures of the backside of the hands?
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