Not exactly correct. The last two digits are the model year and the third last digit is the build year. The fourth last digit is a letter representing the build month. Boats built after a certain date in a year can list the build year as the next year. For example, a model year 2019 built late in 2018 will have a HIN ending in 919, whereas a 2019 model year built in July of 2018 will have a HIN ending in 819.Hull Id. #
The last two numbers denote the year (example) 7654399 it was built in 1999.
Good luck, Joe.