N622 - Conway Stewart 40 Duro Fine Nib (1 ratings) £35.00 Out of stock. Summary; Manufacturer: Conway Stewart. Designation: 40 Duro. Origin: UK. Material: 14ct Gold. Dates from (approx): 1940. Overall Length:28mm. Writing Width: Fine. Notes: All sizes and measurements are approximate. Any replacement nib may need some adjustment when fitted to the pen. We can fit this nib as part of a service on your pen, email us for details. Postage in the UK is free on this item!