What is it

[jtw1313]

This horn measures about 7 inches in length
Not sure what kid of drawings are on this thing any guesses for it's use?

 

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[Back-of-the-boat]

Looks like it might be a scrimshaw whistle?

 

[trdking]

Maybe a mead horn with a hole to wear around the neck? Where did you find this? Does not look old to me.