Hello, and welcome to the WCHA Forums!
Your canoe is a Charles River canoe. Three builders used the tri-lobe deck shape that this canoe has - J.R. Robertson of Auburndale, Massachusetts, Waltham Boat and Canoe Company of Waltham, MA, and H.E. Crandell of Worcester, MA. Since the canoe is 18', it is probably not a Crandell, as he only built 17' canoes.
That three builders would build canoes with such a similar feature may seen surprising, However. J.R. Robertson was the patriarch, his nephew Charles Bertram Robertson was the superintendant of the Waltham Boat and Canoe Company, and H.E. Crandell was J.R. Robertson's son-in-law.
Your canoe is probably marked with a serial number on the stem, but no records survive that would tell us anything. You may find a maker's stamp on the ends of the thwarts, right next to the gunwales.
Cheers,
Dan