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It seems that the ones with significant age do not have the same tops, the same markings, or such. Look for yourself.
This is a reproduction buffalo powder horn made for reinactment. It is also missing the arm or shoulder sling. It is mostly machine made and retails (new) as per the link for $17.95.
Possibly you can obtain the missing parts and make yours complete again; whether it's worth the cost and shipping is up to you.