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The definition of what is a Bowie knife is a moving target - real difficult to answer, and lots of opinion as to where to draw the line. I will be glad to see a definitive answer! OH
There isn't really a specific "Bowie" or "Knife like Jim Bowie's" that can really be defined as the original beyond being a big knife. Most of the things we've come to identify as a Bowie knife are embellishments and modifications. Usually geared toward sales and marketing.
Can't help on the idea of who marketed and sold a "Bowie" knife the longest, but Sheffield produced a lot of knives to the North American market back in those days.