German Beer Stein Mug Das Wandern its des Müllerś Lust das Wandern

Description

I'm not sure about this cup. It looks vintage and as tho it maybe from Germany. However the bottom has an indentation of what looks to be a number "6395" with the words "McCoy" and "USA" stamped on the bottom. It has notches on the handle for what I assume would be for the lid. (I do not have the lid) I have searched the internet and found only 1 other listing here on ebay, however the bottom of that cup is not stamped. I have searched the internet and nothing. (If you know what this cup is and where its made, but are not interested in buying, maybe still shoot me a message?) Thanks for looking!
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