My number
My 1995 H23.5 has serial number HUN A2750 A5 95. The original owner bought it in January, 1995. I'd say it was also built in Jan/95 due to the A5. RickW's boat has E5, 4 months later. I guess Hunter built 68 boats (or 68 H23.5's) in that 4 months? 2750+68=2818 (or 750+68=818).Here's another version of the breakdown that I found on the web:-- snip ---The true meaning of your boat's hull identification number (HIN)Here's some useful information we got from Steve Henkel's book, Boating for Less: How to Save Money When Buying, Owning and Selling Your Power or Sail Boat. This book is a great resource for sailors. International Marine is the publisher. The second edition came out in 1992.The hull identification number (HIN), stamped on a tag or molded into the transom of boats built after November 1972, is generally a series of 12 letters and numbers as set up by the U.S. Coast Guard. Henkel's example: ZTYSR384A787. He says that some manufacturers did not follow the prescribed code exactly. For those that did, here's how it works:ZTY -- This is a code for the manufacturer. CHL means Cheoy Lee. SSU means S2 Yachts. ZTY means Ontario Yachts.SR384 --The next five characters denote the model identification and production number of the specific boat in the series. SR384 stands for Sonar 384.A7 -- These two characters indicate month and year of the Coast Guard certification of the model. The letters A-L designate the months January through December. The numbers indicate the last digit of the year of certification. (This could be a bit confusing for those whose boats which may have been built either in the 1970s or 1980s, for example. It appears that no one expected them to hold up so well for so long. Fortunately the next set of numbers will probably clarify it for you.) The boat in the example would have been certified in January 1987.87 -- These last two characters indicate the last two digits of the model year, which Henkel says normally runs from August 1 through July 31. In the example, the model year runs from January through December.