Korean War? era US gas mask. Anybody know model number?

[Dorffster]

Hi, Guys,

I've spent 30 minutes plus trying to find out more about a gas mask that I am selling for a friend. I've found only three photos of it (third photo below is a different one, actually, but similar), with no identifying information. There is a US on it, and a manufacturing mark that includes a "53" so I am assuming it's Korean War era.

Do any of you kind folks no more about this particular model, like a model number? Thanks!

Dorffster

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