Mr.s. From the anecdotal stories I've heard I think the early 70's was a "get the product on the market" type of deal with neighboring yards swapping hulls, buying excess hulls and finishing the vessels in any way or anywhere. Demand was just starting to ramp up and everybody and their brother was building Taiwanese boats. Heady times.
At one point I compared 2 MT's side by side and the differences were astounding even down to different hulls. Yup, more or less the same boat/layout but enough differences to cause one to scratch one's head. Bottom line is: What's in a name? The "Marine Trader" company in Tom's River NJ was getting boats from wherever it could, rebadge-ing them as MT's and selling as many as they could get.