Wondering if anyone is familiar with the 750A history and serial # ranges? Just sat down and went through a recently arrived 750A. Was very surprised. Came in what appears to be the original box, with original undamaged manual. Manual labeled as pre-release version for S/N 123 and later with an unused tag inside for mail in to receive a copy of the release version of the manual. Unit turned out to be perfect, inside and out. No damage, rework, etc. Only thing I noticed is that one of the switches needs the nut tightened. Even those darn clear thermoplastic switch supports that _always_ break are intact. Looking at the later manual, P/N update codes it only lists 123 and on, 123 - 217 and 218 on. Anyone know what the first S/N sold was and how many were produced? What makes me wonder is that I have S/N 176 in the garage, and my other 750s all have 5+ digit S/Ns top left instead of bottom left.