Serial no. 2509, early American typewriter with two-row ebony "piano" keyboard and mahogany base, interchangeable two-piece type-shuttle with rubber characters, striking spring-loaded hammer behind the carriage, cylindrical metal paper-holder under the plate, manufacturer's plaque with patent dates, with wood cover. – Literature: Martin, 1949, p. 79. – An important collector's item!品相: (2-/2-)