Bob Loane - played 3 games with the Senators in 1939 and 13 games with the Braves in 1940.
Baseball-Reference has him playing with the Cubs-affiliated L.A. Angels in 1934 and his B-R Bullpen page mentions that he was reportedly traded to the Cubs following the 1940 season, but he retired instead.
I have several scans of him at what appears to be Wrigley Field wearing a 1939 Cubs uniform, but I can't seem to find anything to explain him with that team in that year.
Does anyone know how Mr. Loane came to be photographed with the '39 Cubs?