I have an unknown Pirates Team Issued set. They are all blank back and only 3.5 x 2.5. All Pirates team sets I am familiar with are oversized cards yet these are undersized cards. Because of the subjects it is probably 1962 or 1963 as that is the only years that all nine players were on the Pirates.
The pictures used are all over the place.
The Clemente was first used in 59 Jays and then lots of times after that.
The Virdon uses the 63 IDL which is the same as 64 Sports Service
Face and Friend photos are both the the same as 64 Sports Service.
Harvey Haddox used the 61 Kahn's photo. (Pirates 59-63)
The Al McBean photo I have not seen elsewhere.
Donn Clendenon uses a zoomed out version of 63 IDL.
Dick Stuart is the same photo as 61 Kahns and Sports Service.
Don Hoak uses 61 Sports Service