I've done so many very early Royalex re rails, and there was definitely a period in the beginning of Royalex production at MRC when HIN's were not stamped on the hull. I have had a few early ones with numbers written up in the ends of the hulls, but they usually represented the Royalex sheet number. I never got an official company history, to be exact, as to when they started stamping. I suppose I could ask Jim Henry. Stay tuned.
PS The folks currently at Mad River would have no idea.
Cartop Kayak Carriers
Kayak Deck Gear Bags
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