Well they were minted briefly, quite a few minted i should imagine, they were valued at 20d, but the gold value rose to 24d, so there was a 4d profit from melting them down, so many merchants and what not melted probably as many as they could get their hands on. The government realised they'd made a bit of a cock up and recalled as many as they could and they probably melted them for a profit too no doubt. Only about 6 or 7 specimens are known to exist... the rest got melted. (because they were undervalued) Which brings me onto the hammered gold florins they went the other way, they're wasn't enought gold in those so the merchants wouldn't accept them (they were overvalued), so most of those went into the pot too... probably at a loss.