" Gogatsu" means May, "Ningyo" means doll.
May 5 is japanease national holiday as children's day.
But originaly, it was Boy's Festival for celevletion boy's growing. ( girl's festival is March 3 .)
On this day, families who have little boy, set a doll in their house.
These photos are miniature replica headpice and armor of Samurai.
It is a kind of "Gogatsu Ningyo".
In the first photo, that headpice and armor are Date Masamune model.
Date Masamune was a samurai called "Dokugan Ryu" (one eyed doragon).