@en|Scanning of a September 1930 [[Parker]] advertising for the [[Duofold]] model an it ''conversion'' to a desk pen. Published on ''The National Geographic''. Retouched by the author for a better sharpness. | @en|Scanning of a September 1930 [[Parker]] advertising for the [[Duofold]] model an it ''conversion'' to a desk pen. Published on ''The National Geographic''. Retouched by the author for a better sharpness. |