If you are thinking of selling a used canoe knowing what you’ve got is an important first step.
The HIN (Hull Identification Number) is probably stamped or plated on the right stern below the gunwales outside of the hull. That HIN will at least identify the manufacturer and year.
Actual tape measured dimensions are equally important. Length from bow to stern, depth from bottom of the hull to top of gunwales at midships (just lay a board or yardstick across the gunwales and measure up from the floor), maximum width and width at the center of the gunwales (ie in the middle of the hull, measured from edge to edge of the hull material, not between the outer edges of the gunwales). I am surprised at the number of used canoes that are not measured, but only estimated, sometimes badly estimated, ie, 19 foot canoe that turned out to be a 16 footer.
Photos help, especially in determining kevlar or fiberglass, but those accurate measurements combined with the HIN will ID the model and year of most canoes. Post that information here and someone can probably identify the canoe.