|Note_en={{Dating|copyright}} Published also on ''The National Geographic Magazine''. Advertising for a [[Snorkel Pen]], but still reporting [[Advertised Model::Sheaffer TM]] on the box;''[[Sheaffer Valiant|Valiant]]'' version. Explaining its filling system. | |Note_en={{Dating|copyright}} Published also on ''The National Geographic Magazine''. Advertising for a [[Snorkel Pen]], but still reporting [[Advertised Model::Sheaffer TM]] on the box;''[[Sheaffer Valiant|Valiant]]'' version. Explaining its filling system. |