@en|Scanning of a Demcember 1930 [[Parker]] advertising for the [[Duofold]] model in the ''[[streamlined]]'' version convertible for desk set. Published on ''The National Geographic''. Retouched by the author for a better sharpness. | @en|Scanning of a Demcember 1930 [[Parker]] advertising for the [[Duofold]] model in the ''[[streamlined]]'' version convertible for desk set. Published on ''The National Geographic''. Retouched by the author for a better sharpness. |