2 silver reales 1721 worth?

Hello..i can someone please tell me how much is worth this 2 silver reales 1721 ?
.thanks

 

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I think yours may be worth a little more due to the fact that it doesn't look cleaned. But this is a decent reference.
http://www.ebay.ie/itm/1721-SPAIN-S...3?pt=UK_Coins_European_RL&hash=item256a7be733

 

it is genuine?