|Note_en=Scanning of a june 20, 1931 [[Sheaffer]] advertising for the [[Balance]] model. Published on ''The Saturday Evening Post''. Retouched by the author for a better sharpness. Date on the sheet back. | |Note_en=Scanning of a june 20, 1931 [[Sheaffer]] advertising for the [[Balance]] model. Published on ''The Saturday Evening Post''. Retouched by the author for a better sharpness. Date on the sheet back. |