160780 appears on a 18' CS grade square end canoe with a rowing seat. It had half ribs, keel and outside stems. Color is difficult to read, but you have about a 50% chance that it was dark green. It was shipped to Linclon Me in April of 1955. Scan of the build record is attached.
Thanks for the info, Mike. You are correct on the color. It was Dk. Green and still had the original canvas on it until approx. 3 yrs. ago. At this time it is bare and too heavy for me to handle.