Yes, that is 10F. You can tell that it's a 10" by the lead screw FWD-OFF-REV gearbox on the front (and by some other clues). And that it is an F-Series by the legs and the cross feed knob. Also, inspection of the front spindle bearing bearing cap reveals that it has Timken bearings. And it has a Horizontal countershaft. So the first part of the model number is TH. However, guessing the bed length is iffy. Choices are 36", 42", 48" and 54:. Which correspond to distance between centers of 18", 24", 30" and 36".
One word of caution. Never leave it sitting motor off with the half nut lever down (engaged). If the lead screw gear box is not in the OFF position, if you start the motor the carriage will surprise you by starting to move. Depending upon your reflexes, how much attention you are paying, and where the carriage is, you could have a crash. Which will definitely spoil your day.
All of the records having been lost years ago, the standard way of dating an Atlas 10" or a Craftsman early model 12" with Timken bearings is to quote the dates engraved on the bearing cups and/or cones. If you ever have occasion ti pull the spindle. We think that these dates were put on by Timken and Atlas obviously did not practice FIFO (First In First Out Inventory management) so there are numerous examples of later serial numbers having earlier dates and the left and right bearings having different dates so it is only good for about +/- a year. But a rough estimate from your serial number is late 1944 or early 1945. Also, the dating appears to have stopped around late 1952. And the 6" and Mills and Shapers never have dates. Neither do any babbit bearing lathes.
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