Here is something you don’t see often. A Universal Vintage Gas Mask worn in the coal mines.
Protexall Gas Mask from the American Lafrance Corp. Elmira, NY.
It was from Tamaqua, Pa, which was a significant center for Anthracite coal mining in the early 19th century.
It includes a canister and case. There’s wear from age and use. Case is 6 1/2 x 12 1/2 and 7” Deep.