@en|Scanning of a 1928 [[Parker]] advertising for the [[Duofold]] model featuring traditional version and a ''Imperial Duofold'' in ''Pearl and Black'' identical to the model that will be called ''Deluxe''. Published on ''The National Geographic''. Retouched by the author for a better sharpness. Dating provided by seller | @en|Scanning of a 1928 [[Parker]] advertising for the [[Duofold]] model featuring traditional version and a ''Imperial Duofold'' in ''Pearl and Black'' identical to the model that will be called ''Deluxe''. Published on ''The National Geographic''. Retouched by the author for a better sharpness. Dating provided by seller |