Sheaffer PFM Nib Unit. (Medium) N507 £55.00 Quantity: at £55.00 each Add To Basket Summary; Manufacturer: Sheaffer. Designation: PFM (Pen for Men). Origin: Australia. Material: 14ct Gold. Dates from (approx): 1955. Overall Length: 40mm including the section. 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!