Moving on from menko cards for a while. This is a bromide. Bromides were sold as baseball cards, one at a time. It's printed on thin stock, and is, maddeningly, very slightly too large to fit into a binder page. The set is catalogued as JBR 16, and Engel says that it is fairly rare: only double digits of each card known to exist. The backs are blank, but mine has a stamp on it. Google translate tells me that the stamp says "one piece", which doesn't make any sense, so anyone with more insight is welcome to fill me in.
The player is
Takao Kajimoto, who has got to be unique in that he both (1) is a pitcher in the hall of fame and (2) has a losing record for his career. Just barely, I grant, but 254-255 is still a losing record. He played for the Hankyu Braves from 1954 to 1973. He did win the pennant at one point, but, as you might expect, the Braves were pretty bad for much of his career. He was a 12-time all star, and the first Japanese pitcher to clear 2000 strike outs.