We found a copy of a SeaCamper owners manual inside ours. It’s not the actual manual that came with our ’71, it’s a photocopy of one that came from a later year model as far as we can tell. And it’s a bad photocopy along with having a bunch of hand-written notes and highlights from some past owner. But it’s legible and we haven’t been able to find any better ones online so we scanned it and saved it as a PDF. If you own a SeaCamper, help yourself: download the SeaCamper Owners Manual (PDF)
If you grab a copy for yourself, please let us know in the comments.