According to Krause, a real Napoleonic Barcelona 5 Pta coin from 1814 would be worth between $1,000 and $3,500 (See:
http://www.ngccoin.com/poplookup/WorldCoinPrices.aspx?category=10767&worldcoinid=38039). Because this coin is in such good condition, and looks very new, I would be
very wary about assuming it's real.
Compared to the photos we have of other 5 Pta pieces (See:
http://secure.numismaster.com/ta/Coins.admin?rnd=MDZBQBGF&@impl=coins.ui.ucatalog.flat.coin.UiControl_ViewPriceGuideDetail&@prms=4b7261757365436f696e49643d31303736372653656172636849643d31393932323938&@windowId=VHZGO&Ext=login), the lettering and design on the reverse looks a little crude. For instance, the lettering of the word "Pesetas" looks jagged, compared to the finer lines on the other years' coins. Also, the "A" in "Pesetas" has a thick line on the "left" side (the left one being the "/" of the A's upward and downward strokes, whereas in the pictures of earlier years the left side of the A is thin.
I've found a site selling a reproduction of the 5 Pta coin here:
http://www.todocoleccion.net/5-pesetas-barcelona-1814-reproduccion~x27861400, and it looks very similar to yours.
In the end, I think its a modern fake or copy, not an original or contemporary copy, and that it's likely worth a couple of bucks.
If you're really curious, though, send it off to be appraised and/or graded by an auction house or a third party grader. I'm not an expert in Spanish coins, so this is just my unprofessional opinion.