@en|Scanning of a 1953 [[Sheaffer]] advertising for a [[Snorkel Pen]]. Published on ''The Saturday Evening Post'' and ''The National Geographic Magazine''. Date from copyright note. | @en|Scanning of a 1953 [[Sheaffer]] advertising for a [[Snorkel Pen]]. Published on ''The Saturday Evening Post'' and ''The National Geographic Magazine''. Date from copyright note. |