Hi Blue Lander
Your "coin" as stated by Spiral, is a copy of the British Sovereign/Half Sovereign and shows St George slaying a dragon. It is of course not gold but is made of brass. Another "coin" copy often seen is that of a Venetian coin of Duke Aloys Mocenigo (1570-77). The name given to these decorative buttons is HURUF.
The hilt of your jambiya could be either bone or horn of some sort as other horn types were used apart from Rhino.
I would also comment that the belt looks as if it is hand embroidered rather than machine done, which would suggest perhaps that it is less likely to be a mass produced tourist piece.
Stu
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