The boat was certified (built) in August of 1988 for the 1988 model year. The first three characters of the 12 character HIN is the manufacturer’s ID code and TBH indicates the Blue Hole Canoe company. The model is the 17-A which was more or less a longer (17’3") version of their iconic first model, the OCA (15’ 9"). As you undoubtedly know, it is heavy (78-80 lbs).
This would have been one of the later models built by the Blue Hole Canoe Company of Sunbright, Tennessee since the original Blue Hole company went out of business in 1990. One John Williamson bought the molds and other assets and produced some Blue Hole models for a while, starting in 1993 in Gordonsville, Virginia. He did not produce the 17-A. After the reincarnated Blue Hole went bust, some Blue Hole models were produced by the Evergreen Canoe Company of Toronto, Canada but they are now also closed. As far as I know, only Blue Hole Canoe Company of Sunbright made the 17-A.
As far as the Blue Hole Serial number is concerned, it is unique to Blue Hole. Obviously, 17A denotes the model. I suspect they numbered boats sequentially as they were certified, irrespective of model, since I doubt that anywhere close to 8000 Blue Hole 17-A canoes were made. The HIN used by the US Coast Guard has undergone a number of format changes over the years which you can read about here, if you are interested: