Since you love your Retro 1951 Fountain pen so much that you've somehow worn it out, maybe you should replace that nib. Do you prefer to write with different size nibs depending on today's mood? Either way- Retro 1951 offers replacement nibs to customize your existing Retro Fountain pen and keep it in perfect condition for years to come. Replacement nib only with screw-in base to attach to your existing Retro 1951 Fountain pen barrel. Single Extra Fine point steel German nib.