Parker 51 Nib. (Medium) N591 £25.00 Quantity: at £25.00 each Add To Basket Summary; Manufacturer: Parker. Designation: 51. Origin: UK. Material: 14ct Gold. Dates from (approx): 1954 (Date Coded). 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!