OK!

OK!, a photo by William 74 on Flickr.

OK Used Cars was a certified used car program run by GM, to promote the used car sections of Chevy dealers. Advertising promoted the fact that the cars sold were thoroughly checked out before sale, like of like "select previously owned" programs most manufacturers have today.

You can kind of tell how old a dealer is if they still have OK signs hanging around These are probably from the sixties or seventies, and look to have been moved around a bit as well.