Parker 21 DeLuxe Mark 1 fountain pen

This De Luxe model with a gold-plated clip belongs to the first series and was made in 1950. Its filling system is among the most reliable (I’ve never had to repair one), and the ink sac still holds up even after 70 years. One thing to watch out for: do not overtighten the barrel, as it may crack. Comes with 30 ml of ink and a one-year warranty. The pen can be tested upon pickup.