|Note_en=Advertising for a [[Snorkel Pen]], ''[[Sheaffer Sentinel|Sentinel]]'' version, its filling system, mentioning the [[White dot]] and the [[White dot]]. | |Note_en=Advertising for a [[Snorkel Pen]], ''[[Sheaffer Sentinel|Sentinel]]'' version, its filling system, mentioning the [[White dot]] and the [[White dot]]. |