Water Flask

[npicklo]

Good evening, I am looking for some help identifying this flask. I believe it is fake in a sense. I don't believe it is a Nazi flask, I think the pin/badge was put on it. However the flask appears to be original something. I cannot locate any images of it online though. I found a similar flask that looked similar, it was a noted as a French WW1 soldier water flask. Any help would be appreciated. My son purchased it today at a local gun show and I think we were both bamboozled.

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