The coin is a fake brass {rather than gold.} British sovereign, dated 1914, probably the commonest coin used on Yemini jambiya since the late 1970s.
The image on the coin is St. George slaying the dragon...
The hilt is not worth "testing" Which just as well because it would be totally illegal for you to possess in the USA if it was given its clearly recent manufacture if it was rhino..{Without the relevant documentation.}.
Spiral