Thanks Monte,
Those are two links I'll keep in my favorites since they are new to me. I'm assuming the M/C is an ATE' since the OEM dual disc setup is ATE' but I could find no manufacturer markings on the rectangular M/C unit except for the spool (piston-bore) size. Maybe something new will be exposed when I get the unit cleaned-up. I found a new rebuild kit from wirewrkr, now to acquire a new reservoir o-ring. This is a secondary extra M/C unit I'm hanging on to as a spare so I'm in no hurry to get the rebuild done.
Thanks guys for all the info and help.
-Mike V.