Diogenesister:
Compound Where else have I seen that picture it is so familiar. Not on a calendar wasn't around in those days CC
The thought I recall -- legit or not -- was the woman descending into the water was supposedly Damaris; the man baptized, Dionysius; the baptizer, the Apostle Paul.
The image very well could have been used in any one, or several, of the publications. I believe the calendar is circa '70/'71, remembering back to when I worked in the hand bindery.
Damaris was a convert of Paul; the hill in the background is Mars Hill.