http://www.nlbpa.com/mackey__biz.html
scroll down and there is some info on the same (exact) Magazine
this is what it says...
"JAPAN 1927 - A Negro League all-star squad called the Royal Giants became the first pro team to play in Japan. Going 23-0-1, they were so popular that they paved the way for white players to tour Japan in 1931. This incredibly rare Japense sports magazine has cover shot of a Japanese player shaking hands with the Philadelphia Stars Biz Mackey and inside pages show American players black and white; one photo even shows Emperor Hirohito throwing a ball with black players watching -- something no American leader would have done at the time"