Unidentified Vintage Japanese Baseball Cards--HELP

I have had a snapcase of 54 of these cards for years with no idea of what they were; someone just posted a graded Japanese card of something, so I was wondering if anyone on this board could help me identify these and tell me if they are worth anything. Thanks.

Collecting Tony Conigliaro
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Comments
Japan Cards
From what I've been told they are from 1964 and are a Japanese (obviously) Menko set. There are some stars including Sadaru Oh in the set.
It took me forever to figure out what those hands were on the back (batting and throwing sides?) Turns out it's a game of rock-paper-scissors. Apparently baseball cards needed more usage for Japanese kids. The question mark is for a did-you-know kind of thing.
The player on bottom left is Sadaharu Oh....... the all time HR king
Its designation is 1964 Marusan JCM11 [Japanese card Menko set 11]