Vtg Parker 21 Fountain Pen Celluloid 1950's Collectible Aerometric Med hoodedbuddy of mine his dad collected old pens & pencils Parker 21 Fountain Pen (1954 65) Trough Clip, Black, Aerometric Filling System, Medium Hooded Type: Vintage fountain pen with a matching cap. Design: Features a streamlined body, likely made of celluloid or plastic, with a metal cap. Condition: The pen appears to be in used condition, showing signs of age. Value: Collectors often seek these for their craftsmanship selling as pictured. more than