GE Motor cross ref info
Kinda hard to tell; the '5BC' number is most likely the model number. GE changes model numbers more often that most of change our socks! It likely won't be of much use.
3200 is probably the full-load RPM.
4 is most likely the HP. At 3200 RPM.
72 is likely the voltage.
57 might be the full-load amps. At 3200 RPM. Higher speed = lower amps. Lower speed = higher amps. Could be weight though.
60 MIN is the time rating. It's not supposed to run longer than 60 mins. at a time, if it does, it'll overheat. It needs another 60 mins. to cool off.
40 is likely the maximum ambient temperature. 40C = 104F.
B is probably the insulation class. This is the maximum temperature that the windings inside the motor can get without damage. A = 105C (221F), B = 130C (266F), F = 155C (311F), and H = 180C (356F).
SERIES; Type of winding. The armature and field are connected in series. Parallel is called shunt wound.
49; Might be a frame size, but 49 isn't a standard frame. 48 and 56 are. If it has a base, and the center of the shaft is 49/16" (3-1/16") from the bottom of the base, there's a good chance this is the frame size. Might be full-load amps though.
4365; Likely the maximum speed. Since this is a DC motor, speed will be related to voltage and load. If the full 72 volts is applied and the motor is not loaded, it might overspeed.
DRN; GE uses 3 digit letters for serial numbers, there's a good possibility that this is the serial number.
If you apply 12 volts to it, it'll almost certainly run, just not very fast or strong. If it runs backward, reverse polarity. It'll run the other way then.