Bulgarian Шлем Маска 41у (ШМ-41у)

ShM-41u
ShM-41u

The Bulgarian Шлем Маска ШМ-41y was nearly identical to the Soviet Шлем Маска ШМ-41y, only lacking the Soviet factory stamp.  Additionally, a small circular ink stamp can be found inside (or sometimes on the back of) the mask.  This example is missing its BSS-MO-4u filter, and was made in 1979.

Шлем Маска ШМ-41y = "Helmet Mask ShM-41u"

Rubber stamp
Rubber stamp

Size stamp on cheek "0у"

Rubber stamp
Rubber stamp

Date stamp on cheek "79.."

Stamps
Stamps

Stamps inside mask "Z" "30"