Unused advertising cover of Cornish & Co. manufacturers of Grand, square & Upright Pianos, Washington, New Jersey. They also made church, cathedral, chapel, hall and parlor organs. Washington was a center of musical instrument manufacture in the late 19th century. Condition: soft, diagonal crease, top to bottom, on left side of envelope. Minor creasing at top edge. Light soiling. Reverse also has minor soiling, and circular surface tear at center. Otherwise VG. 3 1/2" X 6 1/2"