@en|Scanning of a November 15, 1930 [[Parker]] advertising for the [[Duofold]] model. Published on ''Collier's''.Retouched by the author for a better sharpness. | @en|Scanning of a November 15, 1930 [[Parker]] advertising for the [[Duofold]] model. Published on ''Collier's''.Retouched by the author for a better sharpness. |