Why am I mentioning Kyu Sakamoto? This card is the earliest known of him (although my research against this statement is very limited) and printed just a few years after his breakout single Ue O Muite Aruko (Sukiyaki in Western Countries) made him a superstar in Japan and the United States. Sukiyaki was the first Japanese song to climb to #1 on the American Top 100 charts which did so in 1963.
On a brighter note, these are two previously unknown baseball cards of Sadaharu Oh and Shigeo Nagashima...hopefully they'll make it into the next edition of the Japanese Baseball Card Checklist. This set also has Yokozunas Taiho and Kashiwado which I'll get into the 5th Edition of the Sumo Menko and Card Checklist.....Pro Wrestler Rikidozan is in this set and was was unfortunately murdered not too long after this card was printed.