A copy of the highest quality and very rare thing, even as original, not to mention the copy. Museum quality, which can not be distinguished from the original, unless you know that such a copy exists.
The mug is made of aluminum and covered with black semi-matte paint. There is a stamp HMS37 on it. The volume is 100 ml.
The cup was in the set of field bottles for Jager and medical personnel of pre-war issue and is a rarity. Sometimes can be found as archaeological find in Russia. Since the beginning of the 1940s bakelite cups (black) were widely used, and by 1943 they began to use colored resin (green, orange, blue, etc.).