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I checked with the retired Boston Whaler Rockland, MA factory employee, regarding Ritzyrags' question about the history of the BW19 hull. There was one BW19 hull design; no changes to the hull during manufacture years: early 1970's to late 1970's.

Maybe you came across a BW19 hull clone. See the look-a-like hulls offered in this link:

http://www.gulfcoastboats.net/models.htmmodels.htm