I am in the middle of stripping a PY Rainbow and notice that when the finish is removed the inwales appear to be oak or ash. Definitely not mahogany. Yet the seats, thwarts, and outwales certainly are mahogany. Before I started stripping all the wood was quite dark, yet when stripped the wood is the normal cedar colors. This suggests that the woods weren't stained but instead the varnish had a 'mahogany' stain added to it - like today's Minwax Polyshade product. This stain might also help hide the difference between ash & mahogany grain appearance. Have others noticed this on Penn Yans? Makes sense: They'd make all the canoes the same except for the trim woods. If someone ordered fancier woods they'd slap on the tinted varnish to make everything match (sort of).