Today's menko cards are the first that I'm pretty sure were issued along with baseball cards. Identified as JCM 59, the baseball cards have player photos and text on the front identifying the player, team, position, and his jersey number. Sadaharu Oh is the key card here, though there are other major stars including Shigeo Nagashima. JCM 59's listing in Engel's guide identifies four non-sport cards, but I have at least six different images.
Engel identifies this set as "R3" which means that about 10-99 copies of each baseball menko is known to exist, making it one of the rarest 1970s menko sets.