In the late 80's / early 90's I bought this Stahlhelm for the princely sum of 150 guilders, equivalent to just less than 70 euros. Armed with the knowledge from the French Militaria Magazine I recognised the 1918 model and the Abnahme-Kommando stamp, and I remember I was a bit disappointed by it being an M18 rather than M16. The dealer said he would provide the chin-strap later, however that didn't materialise (and I didn't really think that it would either, although at the time I didn't know how rare these chin-straps are).
Looking back, with today's knowledge, I realise the dealer could have easily sold me a Norwegian / Afghan / ??? refurbished Stahlhelm and I wouldn't have been the wiser as long as the refurbished liner would have looked even slightly like the original liner. Luck rather than skill
The paint has turned brown in some spots, the colour is closest to the actual colour in the pictures from the inside (for some reason the pictures from the outside turned out out of focus).
Best regards, Lars
Maker's mark Q66
Steel lot number in dome