Parker Duofold UK Senior (1950s) - Blue, Aerometric, 14k Broad。Parker duofold senior fountain pen - Etsy 日本。Parker Duofold NS Senior (Danish) - Button Filler, Chocolate Brown。Parker duofold senior fountain pen - Etsy 日本。Parker Duofold Senior with 14k Made in England nib.From 1959. Red color (Dark red Burgundy)I would say it is a “Fine” size nib. Aerometric type. It is currently loaded with Waterman Intense black ink and writes smoothly. You may want to clean it once before use. Since it is a 65 year old pen, of course it will have micro scratches on the barrel.