Mariner 6 imaged Mars in 1969

It has JPL information on the reverse side in blue ink.  It also has a hand-ink-stamped identification number on the reverse side.

From a collection of another former JPL employee in Pasadena California.  

8"x10" glossy black and white

A discount is offered on the listing price if you would like to purchase multiple original photographs.  Note that these appear to have been for internal distribution and were earlier versions before the later black and white backside text versions.  Each one has the P-10332 number hand ink-stamped in a different location on each photograph.