@en|Scanning of a 1927 [[Parker]] advertising for the [[Duofold]] celluloid models explaining dimension, nib grades and colors. Published on ''The National Geographic''. Retouched by the author for a better sharpness. | @en|Scanning of a 1927 [[Parker]] advertising for the [[Duofold]] celluloid models explaining dimension, nib grades and colors. Published on ''The National Geographic''. Retouched by the author for a better sharpness. |