Original coin dates from 379-371 BC. It is called Boeotia from Thebes.
 
Hand made solid yellow bronze Greek coin reproduction. One sided only.
 
The coin is about 10mm
The shown satellite chain is very dainty and is not recommended for longer than 18" long. 
Other 14k gold filled chain length and thickness options are available.
The thin chain is 1.4mm.
Gold filled has 100 times more gold than plated thus does not rub or peel off.