Parker Duofold Button Filler Nib made in Canada (Medium) N390 £39.00 Out of stock. Summary; Manufacturer: Parker Designation: Duofold Button Filler Origin: Canada Material: 14ct Gold Dates from (approx): 1935 Nib Width (Over the Shoulders at the widest point): 7.3mm Nib Width (at the base, the narrowest point): 5.3mm Overall Length: 29mm Tip Width: 0.75mm (Medium) Percentage of original tipping remaining: 60% Flexibility, See description below (0 to 4): 1 Nib Widths: Nibs are graded in accordance with the table below. EXTRA FINE (XF) = 0.3 mm FINE (F) = 0.45 mm MEDIUM (M) = 0.6 mm BROAD (B) = 0.9 mm DOUBLE BROAD (BB) = 1.2 mm TRIPLE BROAD (BBB) = 1.8 mm Flexibility: The flexibility of the nib is graded in accordance with the table below. 0 = No flexibility, a stiff nib with no flexing of the tines when light pressure is applied. 1 = Very Slight Flex, the tines spread up to around .2mm when light pressure is applied giving a slight line width variation. 2 = Light Flex, under light pressure the tines spread giving a one step change in line width, i.e. Medium to Broad. 3 = Medium Flex, spanning approximately two nib width ratings, i.e. the width varies from Extra Fine to Medium with light pressure. 4 = Very Flexible, spanning three or more of the nib width ratings, i.e. the width varies from Fine to Double Broad All sizes and measurements are approximate We can fit this nib for an additional £29 including a full service and return P&P - email us for details.