Mike,
You'll notice that my pictures show Lempco as being in "Bedford, Ohio" which as you probably know has been swallowed up by and become part of Cleveland much as Lempco swallowed up a bunch of companies. They now make only punch dies and related products... a far cry from the truck axles they started making in WW I, huh? From the name of the city, I can somewhat place an end-date by which my lathe had to have been made, but I really can't find an actual time of manufacture, and neither Lempco nor Sheldon (via John Knox) has been able to pin it down for me either... in fact all I got from Lempco was a sort of blank electronic "look." In point of fact however, the history and the operation of the lathe are two different topics altogether, and so far it appears that I can "follow the leader" with the "real" Sheldon owners and be pretty well secure in the knowledge thus obtained.
Froggie