Both the Eddy Jacobs 45 and the Beverly + Butlers on Sassy credit Billy Jackson as the writer. He's promoted to William Jackson on the Gamble issue of Frankie Beverly. which seems to have been released in 1968 while Eddy Jacobs came out in in '69.
This topic throws up a couple of interesting points, I feel. Given that there are concerns that the Northern scene has gone "too funky," there's clearly a substantial divide between a lot of the collectors if 'Pull My Coat' isn't that well known. It's kind of essential funk stuff that's maybe the equivalent of a top 500 Northern record.
Wasn't aware of a version of 'Love, Your Pain Goes Deep' by Los Bravos though - if I understand that's what being said here. Can't imagine it being much cop. Anybody got more info or a link to anywhere that it can be heard?