Carl Zeiss “Umbral” dust goggles with green lenses

General purpose dust goggles or “Umbral” goggles as patented and produced by Carl Zeiss, Jena. The construction of the goggles and the pouch indicates that this is a late war production set. The goggles are featuring uncommon green coloured lenses but this is hard to see on the photographs. Ersatz construction made out multiple pieces which can be observed on the top of the goggles!