They are very interesting figures from those Auction Houses. I like the idea of a puncheon with the word "onc" being made by mistake and then worn out or destroyed, but there must have been a lot of them for that to happen over 7 years, so i do not know what to think. As for the amount of 1854 florins in your survey compared to other years, then i would say it could be because the other years with "onc" in fine condition or worse, do not get sold at auction because of the much lower value than the 1854 florin. To be honest, i had not really given too much thought how this might have happened before your post. Interesting subject though David.