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In 1917, continuing with its policy of expansion, the [[Eversharp|Wahl Eversharp]] acquired the ''[[Boston Pen Company]]'', a company that already started producing good fountain pen in ebonite characterized by a clip wheel. The pens were marketed branded [[Eversharp|Wahl]], promoting as capable to alleviate the wear on the edges of the pockets thanks to their peculiar ''Roller Clip''.

In 1917, continuing with its policy of expansion, the [[Eversharp|Wahl Eversharp]] acquired the ''[[Boston Pen Company]]'', a company that already started producing good fountain pen in hard rubber characterized by a clip wheel. The pens were marketed branded [[Eversharp|Wahl]], promoting as capable to alleviate the wear on the edges of the pockets thanks to their peculiar ''Roller Clip''.