He was always happy to meet a woman, wasn't he. ;)
A little context for the picture: he was still at the post office, and would be for almost another year. His first "big" book from Black Sparrow (At Terror Street and Agony Way) was out, but he was still almost a year away from Martin offering him a quarter of his own income to become a full time writer. So he was still "small time," but he must have felt the rise (no pun intended, Pat) and known he was on the cusp of making a move from small time to, well, medium time anyway.
I think someone got a little mixed up with the address written on the back of the picture though. In 1969 he was at 5124 DeLongpre. 5125 1/2 would have been on the other side of the street.