German Leder B-Maske

The German Leder B-Maske was made of leather, and had two large oval plastic eyepieces. They were mainly used for industrial purposes. The first example features a UA filter connector, and was made by Dagerwerk Lubeck in 1935. The second example uses a ZA filter connector, and was made by Drager in 1957.
Leder = "Leather"

Similar masks in my collection: Austrian M-34, German ASM

Manufacturer stamp inside Leder B-Maske (UA)
"Dragerwerk Lubeck"

Date stamp inside Leder B-Maske (UA)
"Sepr. 1935"

Leder B-Maske (UA) exhale valve cover marked "Drager"

Manufacturer and date stamps inside Leder B-Mask (ZA)
"Drager"
"Okt. 1957"

Nosecup inside Leder B-Maske (ZA)

Drager filter top view

Drager filter bottom view

Drager filter side view