From my personal collection - Rare Antique Victoria Regina Gold half Sovereign Coin dated 1887 set in Sterling Silver setting hallmarked year 1899 (Z) and Birmingham England. Solid round case whereby the coin can swivel around inside, the long solid sterling silver chain is also hallmarked. Coin has been enamel painted on front side - appears this was a common practice once...It is a lovely double box chain 78cm. All in excellent condition.

Weight in total is 15grams - my kitchen scales so could be more or less.

Plain coin on ebay same one are $820NZD and $1,089 :

http://www.ebay.com/itm/GREAT-BRITAIN-1-2-Sovereign-1887-Gold-PCGS-MS65-HIGH-GRADE-NICE-COIN-/292117019095?epid=102079310&hash=item440387f9d7:g:zxsAAOSwU9xUQ6Mi

https://www.ebay.com/p/Great-Britain-1-2-Sovereign-1887/102079310?iid=192260584641