The Kennebec record for serial number 10776 shows an 18 foot long canoe that shipped to Pennsylvania 1917 so that isn't a good match. I'm not aware of Kennebec ever using a rectangular decal. My guess is that you may have a Skowhegan. Their tag and serial number 11206 shown below are similar. The first link below explains why these canoes are often confused saying "The Skowhegan Boat & Canoe Co. was founded in 1930 by Walter D. Grant. Grant was previously a superintendent at the Kennebec Boat and Canoe Company." Can you provide a profile show of the stem shape? Many of their canoes have a very distinctive stem shape as shown in the catalog at the second link below. Nice find,