Baldor 35-1062-869 auto-reversing motor wiring

I have a 1961 Baldor 120V 1/3 hp auto reversing motor, that has three leads. Baldor no longer has the wiring diagram. Two black leads go to the motor windings, and the third lead goes to a relay inside the connection box which connects to several red leads that go to the motor windings. My assumption is that the third lead actuates the relay when it is given 120V, and that reverses the motor. Can anyone confirm? So can I wire the two leads to 120V and neutral via a DPST switch, and the third lead to a SPST switch or limit switch which can supply 120V to reverse the motor?

Second question. The motor is rated 1/3 HP, 1.35 service factor, but it uses 9.5 A at 120V. Shouldn't that be a 1/2 HP motor, nearly 2/3 HP? How can it use 9.5A and be only 1/3 HP? Or is that rating based on specialized use, i.e. constantly reversing direction which would take a lot of additional amperage?