Hmm shouldn't this card be part of a set? Anyway the person who added this card also added this card (and maybe some more?):
https://www.tcdb.com/Gallery.cfm/sid/262284/1949-JBR-83c-Color-Black-Text
Looks like a 1949 JBR set checklist could be made with some research. Granted researching post-war pre 1950s cards from Japan isn't easy, but I doubt there were too many one card "sets" made in the late 1940s.
I collect: Baseball, Football, Hockey, Mostly Vintage pre1980, My Homie teams - Washington/Baltimore Teams Senators (Twins, Rangers), Expos/Nationals, Redskins, Capitals, Bullets/Wizards - HOFers - Non-sport (mostly TV shows and movies).
My Trade List is very much a work in progress
CaptKirk42s Trading Card Blog Curly W Cards Strive For '65 YouTube klandersen42