I recently purchased a lovely vintage 32 Kelly in box leather. I can't figure out the year of the bag and the seller wasn't sure either. She believed it to be from 1960-1970. The heat stamp indicates that it is from the 1960-70 range but the stamp on the hardware indicates 1950's? The zipper pull is missing, so no clues from that front. I think I can make out an "I" stamped on the strap, but I'm not sure. Would any experts be so kind as to weigh in with their thoughts?