The Old Town canoe with serial number 70888 is a 25 foot long, CS (common sense or middle) grade, war canoe model with red western cedar planking, open spruce gunwales, thirty inch hardwood decks, a keel, outside stems, and a floor rack. It was built between March and May, 1922. The original exterior paint color was dark green. It shipped on June 3rd, 1922 to Indianapolis, Indiana. A scan showing this build record can be found below.
This scan and several hundred thousand more were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) and others as you probably know well. A description of the project to preserve these records is available at http://www.wcha.org/catalogs/old-town/records/
if you want more details. I hope that you will donate, join or renew your membership to the WCHA so that services like this can continue. See https://www.woodencanoe.org/about
to learn more about the WCHA and https://www.woodencanoe.org/shop
to donate or join.
It is also possible that you could have another number or manufacturer if this description doesn't match the canoe. The war canoe's dimensions are shown at http://www.wcha.org/catalogs/old-town/dimens-2.gif
from the 1920 catalog. It is not clear how this one got from Indiana to Wisconsin. The only other canoe I've located that shipped to Elkhart Lake, Wisconsin is an 18 foot HW with serial number 123485 that went to R. A. Strecker in 1938. Feel free to reply here if you have any other questions.