Parker. “51” Fountain Pen A Parker “51” fountain pen, the barrel in Black resin fitted with a brushed stainless steel cap. Designed with the model’s characteristic hooded nib and aerometric filling system, the Parker 51 remains one of the most celebrated writing instruments of the 20th century. Model: Parker 51 Type: Fountain pen Filling system: Aerometric Colour: Black Cap: Stainless steel Shipping: Shipped worldwide with tracking.