Help ident rotary encoders, please

I have two types that i found in my junkbox, (just enough for my
mill and lathe, sorry I dont' have more), but no pinouts available:

1. computer Optical Prodducts P/N 101948-01 RevA
also says CM 200-240-QME 0488

2. no make, ST 8432, 20-10-1972-000.

The former (I think) came from Triangle Machine in Silicon Valley
about 5 years ago, and are attached to 24VDC motors, the others
I think I got frrom HSC or one of the other surplus techie places
in Si. Valley on the same trip.

Both types have pigtails with 4 or 5 leads being red, black, white and
yellow.

Any help / suggestions for identifying the leads would be greatly
appreciated.
both types have internal slotted discs.

thanks in advance / mark