This is a very cool Bandai 4-pack dubbed "Shocker Secret Base Set" featuring Kamen Rider Old No. 1, Wolfman, Shocker Combatant Red, and Shocker Combatant Black. There is a cardboard diorama insert included.
It's from the Bandai "Rider Hero & Kaijin Series".
Comes in original packaging.
Kamen Rider "Shocker Secret Base" 4-Pack (Bandai, 2002)