SLO-SYN

Can anyone tell me what I have here?
The label reads as follows:

SLO-SYN Synchronous / Stepping Motor
Type M112-FJ25C2
840 oz.in.
1.75 volt
12.7 amp
200 steps / rev
Spec. BM101025 / BM131444

The motors are 6 wire, but they also have what looks to be an encoder built onto the back end which also has 6 wires.

What do I have here?

How do I identify the encoders?

Thanks for any help.

Charles Hopkins