This is one of the nicest die cut sets since the artwork is very realistic compared to some others from that time which were quite a bit cruder. And of the "realistic" looking ones, its one of the few to show most of the player's body rather than just a head shot. The team logos on the bottom also add a really nice touch, as do the bold colors.
The backs have a circle at the top which say either "Pacific League" or Central League, while the player's name is written in the dark column in the middle.
From left to right I've got Yoshio Tempo, Nobuo Oshima, Kaoru Betto (HOF) and Hiroshi Oshita (HOF).
Engel has catalogued 18 cards in this set but there might be more. It has an R3 rarity rating which means there are fewer than 100 copies of each known to exist, which seems about right. This is one set which I really do want to complete since they are so beautiful, but will likely take some work as they don't show up in auctions that often!