Hello,
Effectively, your coin is a Lima 8 Reales silver piece. By your photograph, I'm guessing it's a fair F-VF. Here, in Peru, these coins are somewhat common, but that does not mean they're worth only their silver content. They are usually traded here for around $120-150, but since I do not know their value on the outer market, it might be worth more or less than that. I've been checking sold listings on eBay, and it usually goes for around the same price. I might suggest an auction instead of a buy-it-now option if you wish to sell it.
Regards,
Piero
silver stacker with a goal of a $1500+ usd coin

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