the site confirming that the date had been mis-typed when compiling the spreadsheet from the original ledger. He told me that it would soon be corrected on the website. Frits attached a photo of a spread of pages of the Sneek registration ledger showing De Nieuwe Zorg as the last entry.
One very interesting online discovery we made was an interactive page with a detailed drawing of a skûtsje with part names in both Dutch and Fryske. The link to the interactive page is here. This will be very useful to us as we head into restoring Nieuwe Zorg to full sailing trim.