I've bought on eBay one ancient (almost pre-historic) MARATHON electric motor model BC 50 (or PC 50). This is my best guess, because the nameplate is illegible. I do NOT know anything else about this motor. All I know is that this is brushed commutator motor. I do not know POWER specification, RPM, Voltage, how to change direction of rotation.. etc Simply put, nothing.
Please, help me. I would like to use it, because it seems very solid and very well made motor.