The Dodgers knocked out several official postcard sets during the 1970s. They probably went out to fans at the stadium, local businesses, or for team promotions. Only two issues included a numbering system and solid shortstop Bill Russell filled that role in 1975. (Charlie Hough sat at #5 for 1976.)
I like Bill's throwing pose, an unconventional release shot, though today's photographic quality would far exceed this card's somewhat blurry colors. Russell played in the famous 70s L.A. infield with Garvey, Lopes, and Cey and also answers the trivia question, "who replaced Tommy Lasorda as Dodger manager?"
The back's as blank as any postcard should be, aside from the address space and vertical divider. Can you spot the #5 designation? It's waaay up in the stamp square as a "-5" suffix. Beggars can't be choosers--a type card by any other name would fill the 4-count sheet just as well.