I recently picked up several cards from the 1969 JGA 183 set, a set that Engel refers to as the "Perforated Trump" set. There's not a lot known about these cards but Engel states that they were most likely a magazine insert. There's only twelve cards in the set that they were distributed in a perforated strip. It's apparently a pretty rare set - Engel gives it a "scarcity factor" of "R5" which means "5 or fewer copies known of most cards". Since I don't know where these cards came from, I don't know if any of them are from the five or fewer that Engel knows about.
The cards themselves are small, measuring 1 3/16 inches by 1 1/2 inches. Each card has a playing card suit on the front - each suit has three cards. The fronts also include the player's name, team and position along with some text about the player. The backs are blank. Engel mentions that the year the set was published had to be 1969 because the Yutaka Enatsu card mentions him setting the strikeout record in 1968 and the set includes Masaichi Kaneda who retired after the 1969 season.
I have seven of the cards from the set:
The five cards I don't have are for Sadaharu Oh, Shigeo Nagashima, Shozo Doi, Masahiko Mori and Katsuya Nomura.