|Note_en=Published also on: N. 26 (1927-06-26). Advertising for the [[Duofold]] model in its colors for the unbreakable barrel and the 25 year warranty on the nib. | |Note_en=Published also on: N. 26 (1927-06-26). Advertising for the [[Duofold]] model in its colors for the unbreakable barrel and the 25 year warranty on the nib. |