N509- Parker Duofold Slimfold #5 Medium Nib (2 ratings) £25.00 Out of stock. 0 in your basket View Basket Checkout Summary; Manufacturer: Parker. Designation: Duofold Slimfold #5. Origin: UK. Material: 14ct Gold. Dates from (approx): 1970. Overall Length: 22mm. Writing Width: Medium. 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!