30s Large Art Deco "tight Top" Cellulose and Tin Button Coat Button Jacket Button Robe Button Crafts

Cellulose was in general use starting in 1920, and the art deco movement ranges from the 20s to the 40s...so I am placing this in the 30's. A large hollow button made of tin covered with a cellulose top, called a "Tight Top". Button measures a large 2. 5 inches across and is .50 CM thick or 3 16ths of an inch. The back has some rust, so maybe mad of tin? This would be great on a coat from the era, or if you are a button collector, just an unusual bit of miniature art deco design/art for your collection.