Veteran infielder Don Johnson came off the Cubs bench to, as mentioned in his back bio, play one final pro year in California. The average PCL player was over 30 years old in 1950, so he might've felt more comfortable out west, playing alongside guys of similar age.
The SGC EX 5 rating on such a clean, balanced card tells us that graders found its touched corners and print fisheyes worth marking down more than one might for other sets. It's possible the diagonal streak on Hage's logo happend during printing or from a later collector. Scarcity trumps technical grade for most Hage's cards and the combined SGC/PSA population reports show just seven total graded. This rates the highest on either one!
Hage's Dairy of Southern California sponsored regional card sets from 1949-51, offered at concession stands for Lane Field Park, home of the PCL San Diego Padres. Most came packaged with popcorn and it's possible others entered the hobby via company or team promotions. 1950 singles prove tough indeed to find, as the PSA population report counts 66 total graded for its 128-player checklist. All 1950 cards come with black-and-white fronts and use similar text size for player and team names, distinguishing it from Hage's other years.