Hello, Bruce,
Old Town 102775 is a 17 foot HW model with sponsons, so you may want to check the number again, at both ends, and compare. Even if the sponsons have been removed from a canoe, OT put carry thwarts on their sponson canoes, and those thwarts can give it away--- plus the difference in deck style between the HW (which has the standard OT short deck) and the Otca (which has a longer deck with coaming). You probably know these differences, but it helps others who are new to old canoes to point this out.
I can poke through the records and see what I find that might fit what you have...
Kathy