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This is a 1910 Waterman – “World’s Smallest Pen” eyedropper-fill in Black Hard Rubber. Often called the “Doll Pen” because one rests in Queen Mary’s doll house, on the King’s Library Table. Just over 1.5″ long and less than 1/8″ in diameter, this pen was actually produced by Waterman as a way for their salesmen to spend time with potential new accounts. Their salesmen would visit a druggist, jeweler, shop owner, to try to open …