[65Bowrider]

According to the Patent document I have, the patent was granted Mar. 1, 1966 and considered to be a "functional" patent that gave a broader range of protection than a 'design' patent would have. It was good for 17 years. From the time of filing to approval, the "Patent Pending" gave protection.
In the 60's with so many up-start boat building companies, it was common for a boat to be flipped and a new mold created for the new company. Not necessarily honest, but done.
Since the time the patent expired, many companies have copied the VDR, but they will modify it, in an effort to make improvements.
I think by this forum existing with so many loyal members, makes a statement as to which is best...
Jason's moto, "often imitated, never duplicated" is very true. IMO, if you have a classic SeaCraft, you have the best.