There had been 2 realeses on the Jo-Mar label
one was you know was T.Barnes version of Sam Williams and the other one that I know of is an Ohio Players track called ''Stop lying to yourself'' b/w ''Lonely Street''
Bothe these realeses are credited to Kompass Productions and an adress of 6832 Linwood Ave. Detroit MI SA-5-8176 - Motor City Pub. BMI
On the Ohio Players 45 in the deadwax has JM 1029A stamped on but no other matrix mark ? the label is molded in the vinyl.
Never seen anything else on this label design so I think that these may have been a private press, could be wrong though