The upper left card is uncatalogued. We can tell from the text on the back that it was part of a playing card set produced by Boken Oh magazine as a New Year's gift to readers, and was inserted into the magazine. We have no idea
whether the set consists of baseball players or famous people from all walks of life. Based on Oh's appearance and the style of card, we judge it to be from the mid-1970s. The upper right card is from the 1975 JCM 165 Rocket Robot Set.
At lower left, we have c. 1962 JGA 149 Sideways Playing Card Sadaharu Oh, and at lower right, c. 1961 JCM 163 Playing Card Backs Sadaharu Oh card. These are all essential elements of a Sadaharu Oh type set.
Size: Boken Oh Card--1 5/8" x 2 1/8". Rocket Robot--1 5/32" x 2 15/32". c. 1961 Playing Card Back--1 1/2" x 2 1/2". Sideways Playing Card--1 1/4" x 1 7/8".
Condition: Boken Oh--Nm. Rocket Robot--Ex/Mt. c. 1961 Playing Card Back--Would be Nm/Mt but has a crease at lower left. Sideways Playing Card--Nm/Mt