@en|Scanning of a May 9, 1953 [[Sheaffer]] advertising for a ''Valiant'' [[Snorkel Pen]]. Published on ''The Saturday Evening Post'' and in the same year on ''The National Geographic''. Date on the sheet back (and from copyright note). | @en|Scanning of a May 9, 1953 [[Sheaffer]] advertising for a ''Valiant'' [[Snorkel Pen]]. Published on ''The Saturday Evening Post'' and in the same year on ''The National Geographic''. Date on the sheet back (and from copyright note). |