Need help for identification M1 Helmet

[rhineriver]

Hi. 20 years ago I was buying a M1 helmet, liner and cover in a surplus store in Switzerland. Now I try to identify the date of manufacture and the manufacturer. It would be nice if you can help me.
Shell is stamped inside 19901
Liner has the Firestone logo and No. 26
All I can read on the cover is

....MET CAM
....DUCK....ERDL....PATTERN
...SA...00.....1701
...415-105......
Thank you for helping me
Some pics

Information

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