US M1 Helmet; Year?

[Geology]

Hallo everybody! First of all it is my first post in this forum It´s quite interesting to read here

Here you see an old US (?) M1 helmet, which I bought in Poland about 10 years ago. The salesman told me that this helmet was used during the Korean war...But I don´t thinks so.

Here some facts: the helmet got an sand texture, is rear seam, swivel bale with a steel rim. In the rear of the helmet there is a stamp with "MAC" and inside the helmet there is no stamp, inside the helmet liner also-> Probably an indication that this helmet isn´t a real US Army helmet? Inside the helmet liner you can read a writing: SGT v/0 Berg. I don´t know what this means... Maybe someone can tell me more about this helmet and the year of production? Thanks in advance!

[Geology]

P.S. You can also see that the colour of the helmet inside is a bit brighter in comparison to the outside!

[earlymb]

I think it's a Dutch M51 helmet; at least the liner is. The shell might be stamped with maker and year somewhere on the rim on the inside. Dutch shells were smooth finish though.

[Geology]

Thanks for your quick response I will look it up!

[Geology]

Ok. The shell is stamp, but you can hardly see. With a very bright torch you can see the number 8721. The liner is also stamp with EC NL 77...Sorry for my bad investigation and observation about the helmet-_-. On the rim is something stamped but you couldn´t read the numbers etc. You only see that something is stamped. Ok so it is a typical "Euroclone" of an M1.

[earlymb]

I think it's a Dutch M51 helmet; at least the liner is. The shell might be stamped with maker and year somewhere on the rim on the inside. Dutch shells were smooth finish though.

I made a typo, that should be M53.