Generally, Old Town did not put the build records on letterhead. Your build record should indicate a 18' HW in CS grade with 20" birch decks built in 1920 and shipped to Buffalo NY.
Copy is attached in case you don't have the correct one. Is it still in the Buffalo area?
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/catalogs/old-town/records/ if you want more details. Please join WCHA or make a tax deductable contribution so that services like this can continue. See http://www.wcha.org/wcha/ to learn more about the WCHA and http://www.wcha.org/join.html to join. If you are already a WCHA member, THANK YOU!
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. Feel free to reply here if you have any other questions.