I don't know about 1954, but in the 1980's Mr. Chow had his own gun shop on Mission St. In San Francisco. He sold it in the early 90's I believe. I read recently that the most recent owners shut down after tiring of the City's policies. (The owners of the San Francisco Gun Exchange, the Posner family, did the same a few years earlier for the same reason.)
I loved both shops. Mr. Chow taught me more about bullseye shooting just by giving me advice as I stood at his counter than I ever learned elsewhere. He sold me my first target pistol: a S&W Model 41.
The Posners are a wonderful family and ran a great store. Bought lots of guns there. I was one of their "low-end" buyers but I was always treated as a valued customer.