Mentmore Auto Flow Nib. (Medium) N571 £22.00 Out of stock. Summary; Manufacturer: Mentmore. Designation: Auto Flow. Origin: UK. Material: 14ct Gold. Dates from (approx): 1950. Overall Length: 27mm. 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!