PRODUCT DETAILS:
1976 SSPC is a 630-card "collector's issue" released by TCMA. Dubbed the "Pure Card" set, the designed was based loosely on the 1953 Bowman set. The set was available exclusively via mail order and was advertised in the nascent Hobby Media, such as it was in the mid-70s.
Despite the cards bearing a 1975 copyright, the set is considered a 1976 set as it was not released until then. SSPC was not licensed by either MLB Properties or the MLBPA, and shortly after its release, was sued by Topps. As part of the settlement, SSPC agreed to never reprint their 1976 set, and to never attempt to produce a similar product ever again. Keith Olbermann, then still in high school, edited the copy on each card.