Green River metal whiskey canteen or flask

Someone asked me about this flask, and I have never seen one before. Can someone help with age, rarity, value?

Volume of this 4-5" tall flask is believed to be about a half pint.

It is embossed:

The Whiskey Without A Headache
GRSM trademark
Green River
Bottled by Green River Distg Co
Owensboro, KY

Early 20th century?
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