I believe this is a commuter pass from April and May of Showa 22 (1947). On the back, there's an advertisement for the pharmaceutical product "Oibestin," giving it a Showa retro feel. It's quite old, so there is age-related deterioration. Keywords: Antique / Collection / Vintage / Showa Retro / Showa Era / Train / Railway / Ticket / Commuter Pass / Abandoned Line / Abandoned Station / Railway Fan / Antique / Hard Ticket