Hello Jonah--
Old Town 22517 is an 18 foot AA grade Ideal model shipped in 1912--
I also checked 122517 (sometimes the initial "1" is hard to see) and it's a 15 foot roundbottom rowboat.
So, neither of these numbers fits your 17 foot canoe.
Check the serial number again-- look at both stems and compare. Sometimes a digital picture will make the numbers clearer. Posting pictures helps too-- we can give you feedback on what you have, and we enjoy knowing "what's out there".
Several of the old canoe companies used the same serial number format, so pictures help with identification. In the FAQs section of Forums you'll find instructions on how to upload pictures, if the process seems confusing.
Looking forward to knowing what you have!
Kathy