Hello again, John. I'll attach images from the 1935 Old Town catalog, giving what they say about the Otca and HW models, and will also attach a page showing canoe specifications. These images are courtesy of The Historic Wood Canoe and Boat Catalog Collection, version 2, edited by Dan Miller and Benson Gray, published by Dragonfly Canoe Works and available at
www.dragonflycanoe.com.
Generally, I believe the HW is thought of as the boat for "bigger water" and is the model more likely to be used as a sail canoe or with sponsons, although sails and sponsons could be put on anything. The HW has very attractive lines and that's perhaps why yours was thought to be an Otca. You called it correctly when you noticed the deck!
Ordering replacement parts from Old Town seems like going to the Subaru dealership for wiper blades. Many of the folks here need to jump in with better suggestions... guide you through the things you can do yourself. (If nobody jumps in right away on this thread, that's because it's "serial number search" and not "wood canvas/fiberglass").
You might try using the "search" function at the top of the page to find discussions of rib bending and replacement and other repairs you have ahead of you... but post questions and let those who have done this at home in their spare time tell you what they did, and share their pictures... this is fun.
Then, load your canoe on your car and take it to a WCHA event--- a chapter paddle or even the yearly Assembly--- after showing off the "after" pics in Forums! The fun goes on and on. And there may be more boat projects in your future... it kinda gets under the skin.
Kathy