Can you post a picture? There are several companies that have five-digit serial numbers, which made long-decked, sponsoned canoes. Pictures are uploaded by scrolling down to "manage attachments", and clicking on that to get a browse box that will let you find a picture in your computer.
If you don't have any pictures, please describe the canoe as best you can. Is the serial number on the stem, or on a metal plate, or both?
There's an Old Town with that serial number, built between January and April 1911, but it doesn't have sponsons. Sponsons could be added at a later time, but usually it's the other way around: the sponsons are discarded at a later time. Old Town 16556 is an 18 foot CS (common sense) grade Otca, with 20 inch decks. If the long decks on your canoe are 20 inches, and if your canoe is 18 feet long, this could be the right record. The decks are ash, as are seats and thwarts... gunwales are spruce and planking is red Western cedar. It was painted dark red and two dark red repair kits were ordered. It had a painter ring and a keel. It was shipped 4/10/1911 to Sault Ste Marie, Michigan.
Please don't assume this record goes with the canoe you found... as I said, there are many canoe builders who used a serial number system that would place five digits on the stem of the canoe... the best way to tell for certain is to share some pictures.
I'll add the scan for this OT canoe. Scans of approximately 210,000 records were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) and others. Additional information about the project to preserve these records is available at
http://www.wcha.org/ot_records/ if you want more details.
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Kathy