Rare 1986 Showa Calendar - Unopened - Recommended for those born in 1986

I found this while cleaning my parents' house today.
It's a simple desk calendar.
I didn't know the details, so I looked it up on Google.
It's still shrink-wrapped, so I haven't checked inside.
Recommended for those born in 1986 or collectors of retro items.

Unopened Showa-era retro items rarely come on the market, so why not take this opportunity?

Thank you.