Hi Guys,
well, I got the helmet, and sorry to say, the stamp is not that great, all I've made out in the circular stamp is (Riemenfabrik) (AKT.) (Ges) 1913 dated and Neu-Isenburg, I'm still working on it, to the left of that stamp is a blurred name and what looks like (Donau) and 125, inside on the back visor I see a stamp on the left side of a box that has AK31 in it then the date 1916 and BJAXVIII stamped into leather with the Roman numeral I. was this a depot worked helmet?
Regards,
Kevin