U.S. Army ABC-M17 Field Protective Gas Mask
The U.S. Army ABC-M17 Field Protective Gas Mask used internal cheek filters, making it lighter and less cumbersome than previous gas masks. This design saw many years of use, and was copied by several other countries. Production began in 1959. In 1966 a drinking straw was added, resulting in the M17A1. The top example was made by Daytona Tire & Rubber in 1963, shown with Optical Insert and M1 steel pot helmet in middle pictures. The bottom example is shown with Cold Weather Kit installed, and was made by Mine Safety Appliances in 1964.
Similar masks in my collection: U.S. Army M17A2, Czech M-10, Bulgarian PDE-1, Polish MP-4
Size stamp on forehead "US M"
Manufacturer and date stamps on cheek "63 D.T. 2D-10" "M27 C1"
Lot stamp on cheek "2021-42-2262"
Manufacturer and date stamp on exhale valve cover "63 D.T. 2D-10"
Manufacturer and date stamps on exhale valve "DT-C15 63-59-1" "1-F 47"
Stamp on head harness "2011-33-17 C8R1"