RARE! Montblanc no. 50 4-colour ballpoint pen silver metal flat plastic top Year of production: Mid-1960s Manufacturer number: None Colour: Silver metal Plain surface, no guilloche Length (open) in cm: 13.5 Diameter in cm: 0.95 Material: Metal base Technical details: Flat plastic top Remarks: Chrome, flat plastic top, branded “ETHICON” (Sold without display) It can still be used, as it works with the regular D1 4-colour refills, which can be found worldwide, needs new refills. In excellent condition, all parts are original, the pen is fully functional, it shows no brassing and no cracks, very good condition! These 4-colour pens are not easy to find!! Insured shipping.