This is a Magener Werfer, on which the Genter Werfer was based. Any futher info would indeed be very welcome. If any dimentional info is available, I can at last draw this gun... Does anyone at least know the calibre?
Super work there Arie. That diagram will be a handy reference. Well done
The reverse of the card, dated July 1917 says:
"Esteemed Kinal family, have arrived well in the Vosges Mountains but there is no bed to be had, and we are already hard at work. Kind regards, Sergeant Grimminger. Please respond when received."