Troy Saxon's work could be considered transitional since he began in the posing strap era of the 50's and carried on into the wide open late 60's.  This color photo is listed by several reputable collectors as a "possible Saxon," and it looks like Mike North to me, so that could be true.  The interesting historical bit here is the see-through posing strap, a device also used by Walt Kundzicz of Champion.

Edited to add:  Viewer jsstrand tells us in the comments that this is Keith Clayton by Mel Roberts.