Pertinax- Yep, I'm 99% sure that it's real. I have seen fakes when in Spain, and I accidentally bought one back in 2008. So I have become much more familiar with this type of coin.
It is amazing just how many fakes flood Spanish coin shows. I went to one in Barcelona one time, and I swear that about 40% of all coins for sale were fake. But, luckily, most were horribly bad fakes (8 Reales with raised chop marks, fake 5 Peseta coins with a fake George III counterstrikes - quite an anachronism, fake coins with the wrong reverse, etc) , so it was not too difficult to find real coins.