Medium weight cotton duck fabric (a lightweight canvas type material) with a great Early American style sailing theme print, very 'old New England'.
It's 1950s or 60s vintage fabric, 36" wide. Selvage is marked J Manes.
This is a 3 yard length of unused fabric, never laundered. There's soil marks or discoloration on the outside folds, faint yellowing on the selvage and fold lines. A good soak would probably help here!