Feed drive Master Motor #s; Style 248783 Serial# CP17987 Type PA Frame 5217, Volts 220, Amps .6 ,Phase 3, Hp 1/8 Code Rating M, Temp continuous 50* C
This is so old news but it is real time for us. If these codes do not align with yours, it is a different motor. We are winding down to where these very close machines were delivered.
I'm thinking that these are different motors, as my "Style" and "Serial" numbers are different (120776 and CS40204, respectively) as are the "Phase" and "Code Rating" (the Phase for mine is 2, and the Code Rating is blank). Everything else is the same as on your motor. I wonder, given that 1956 was a transitional year, if they were using parts from the "M" series? Just a guess (I'm quite new to the Bridgeport world, of course).
I've included some additional photos of the entire machine; the turret seems to be from an "M" style, while the ram is the newer style. It seems to have been painted, as it's not gray (thinking that gray is a standard color?); the current paint seems to be a blue of some sort.
Very interesting about Mr. White and your connection; I'll check out some of his books and hope to learn more about how these machines were used to build engines (and most of civilization, it seems!).