|Note_en=Advertising for the [[Duofold]] model for the [[button filler]] citing its colors, the unbreakable barrel in ''[[permanite]]'' and the 25 year warranty on the nib. | |Note_en=Advertising for the [[Duofold]] model for the [[button filler]] citing its colors, the unbreakable barrel in ''[[permanite]]'' and the 25 year warranty on the nib. |