John Manships auction Oct 2011 suggests that the coloured promo is a West Coast press - Whatever copy you have it is still a great record and hasn't suffered death by overplay like many of it's contemporaries.
"Discovered by Daly City Bob, perhaps the very first Yank to get the feel of the “Northern Soul Sound”. On a road-trip as his buddy Henry Mariano played through a pile of 45’s, out of the little portable came Carl’s booming vocal riding Bob Halley’s juggernaut production! Within weeks it was in the UK and on the turntables of the Northern Sea rare-soul-haven that was Cleethorpes! Tells a great story does Bob but his copy he sold me back then, was the rather plain White Label DEMO. Before you today is the glorious multi-coloured vision of the west coast press. Great tune - eye-grabbingly gorgeous, in this format.
Sorry, this item has already been won!
The winning bid was £ 274.00"