Palmer ditched his baseball cap often enough that mop-top photos like this one appear on several cards. This blog already profiled a representative league leader card (1977 O-Pee-Chee #5) and fellow collector Beardy recently pulled a similar 1/1 painting from 2010 National Chicle.
SSPC published this 42-card collection of contemporary and retired MLBers as a star-filled predecessor their 1976 630-card set and sold it by mail order through Collectors Quarterly magazine. A few of its pictured HOFers show up on unusual teams, including Ted Williams: Texas Ranger (likely taken during his turn as their manager) and Warren Spahn in a Cleveland Indians uniform, making it more attractive to team set collectors.
Value: These cards seem readily available via Internet search, but cost somewhat more than most SSPC releases at $5 - 15 for stars.
Fakes / reprints: Haven't seen any in the marketplace and it'd be tough to make money selling SSPC fakes.