I've only seen those 45 degree clipped rib top corners on Thompson.
Hi Fred, my canoe has a shoe keel and all the screws are slotted brass, not Robertson. Not sure when the Canadian canoe companies went to Robertson screws, suspect it was in the 1940's. I think I would use a chemical stripper on the deck, tough call though. A heat gun or careful scraping/sanding might also be the way to go??? Chances are that you won't find a decal but hopefully you can find a factory decal shadow on the wood surface and/or 2 small nail holes from a brass serial plate.