Of course, we don't know that the boat is a Discovery model but Discos were and are polyethylene.
Old Town made somewhat similar hulls in both three layer poly and Royalex such as the Penobscot 164 (poly) and the Royalex Penobscot 16, or the poly Penobscot 174 and the Royalex Penobscot 17, and still do.
They have also added to the confusion by renaming some of the hulls originally called Discoveries. For example, the Discovery 174 (the original Discovery) later became the Allagash 174, and is now the Penobscot 174. But they are all three layer poly.
ODEO Laser Flare
Dock & Launch Systems
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