Hey Hans and All,
Here is my small selection of German masks.
My M1915 Gummi Mask and can, showin the filter markings, showing that it is a II-C-II filter made 4. Juli 1918, and the instructions are the later style for the Rahmenmaske, and this one has the later steel springs.
My Austrian Gummi Maske, it is the same style as the German model, The filter is dated 18. April 1918, The markings on the mask by the eye piece are KuK Geprüft with the double headed eagle and it is dated 21. Dez. 1917
This is my lederschutzmaske, the filter is dated 18 Jan 1918 and has the dust filter attached, the "spare lenses" are shown next to the filter, they are coated with a gellatin layer to absorb moisture to keep the wearer's vision clear, they woule absorb enough moisture to allow the mask to be worn for several hours with out loss of vision.
This shot shows the straps of both Gummi Masken, they are both the later style with steel springs.
I appologize for the size of the images, my internet service sill is handled for the last 12 miles by pony express, and I am limited in the size of image I can up load. later I will try to post photos of the British small box resperators, and the US SBR, as well as the French ARS17 and Belgian ARS18.
Best wishes
Gsu