As the tags indicate they are signatures of the 1978 Yakult Swallows. The ball on the left with the CBL (Central Baseball League) is an official game ball.
The notable signatures are HOFers Tsutomu Wakamatsu (player), Masahiko Mori (Coach) and Tatsuro Hirooka (Manager). As well as Americans Charlie Manuel and Dave Hilton. It's difficult to see the signatures well with the tags there.
I think the pair might sell for $100 or so.
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