Evaluation for my English friends

Hello,
I would like to know how your one gold sovereign George V in 1912
is there a value price of gold or value with a rating










Sorry,for my very poor English because I am French

Thomas

https://en.numista.com/catalogue/pieces11463.html

 On that page today it says:  Bullion value:  263.35 GBP

http://www.ngccoin.com/poplookup/World-Coin-Price-Guide.aspx
  The above GBP value is for the gold. The page below has USD valuation for the coin ...
http://www.ngccoin.com/poplookup/WorldCoinPrices.aspx?category=43192&worldcoinid=124061

Though on this occasion I now see the only value for 1912 is the same as higher up the page >
  Melt Value: $390.15 (12/28/2012)

http://www.ebay.co.uk/sch/i.html?_nkw=sovereign+1912+-half&_sacat=0&_odkw=sovereign+1912&Era=George%2520V%2520%25281910%252D1936%2529&Denomination=Sovereign&_osacat=0&_from=R40&_dmpt=UK_Coins_BritishMilled_RL&LH_Complete=1

   That long link is for UK completed listings - the first three on there sold for  £278  £277  £310

Thanks  

Thomas