|Note_en=Scanning of a June 1926 [[Parker]] advertising for the [[Duofold]] model. Published on ''The American Magazine''. Retouched by the author for a better sharpness. Dating provided by seller. | |Note_en=Scanning of a June 1926 [[Parker]] advertising for the [[Duofold]] model. Published on ''The American Magazine''. Retouched by the author for a better sharpness. Dating provided by seller. |