It looks pretty good to me, I can't even tell if the gunnels have been replaced, those inwales look good also. The canoe looks like it has not spent too much time outside, no dark stain on the tips of the decks or ribs where it might have laid on wet grass or sand too long and the wood started to deteriorate.
If the canvas is original then it looks pretty good for it's age but will no doubt need to be replaced down the road. If it has been fiber glassed like YC mentioned, that can be a problem.
I think they came with spruce inwales and oak or ash gunnels.
I saw a Chum sell in central NY last year for $700-800 iirc, it's pics didn't show as nice a canoe as this.
The seats are an easy fix back to original, hand webbed cane with a little effort, pick up the book "This Old Canoe" for excellent instructions on Chestnut seat repairs. (and excellent diy instructions on canvasing/filling/painting your new Chum)
To some folks a Chestnut Chum is not that big a deal, an average "cottage" canoe with not a great reputation for quality workmanship. You can use that as leverage.
To others (like me) they are considered a pretty darn good solo tripping canoe that came from the Chestnut factory. Nothing wrong with custom made canoes by modern builders, they are almost always better made canoes than Chestnuts, but they are not original Chestnuts which means a lot to some folks (me) or nothing to other folks, to each his/her own.
If the canvas has been replaced and looks good (no cracks/peeling paint), the wood work looks good, around a $900-1200 might be a good price. If the canvas is original and has cracked paint/peeling paint you will need to figure in a new canvas. If you can do it yourself it's about $225 for material,(canvas, home made filler, paint and incidentals) a pro might charge $1000 or more.
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