The Belgian M24 used a leather and metal facepiece made by Pirelli. The Italian mask had a leather hose and square filter, but when imported to Belgium in the 1930s, the hose and filter were replaced with parts from existing Belgian masks (M1931 and M1934).
Size stamp on cheek "PT"
Size stamp on head strap "PT"
Size stamp on valve assembly "PT"
Manufacturer and date stamp on hose "SACIC" "1932"
Stamp on hose "11"