|Note_en=Advertising for two [[Parker]] models: [[Challenger]] and [[Duofold Geometric]] bot in celluloid in ''"Jet Black"'', ''"Brown Pearl"'', ''"Grey Pearl"'' and ''"Green Pearl"'' colors and two sizes (''Men's Long with Clip"'' and ''Ladies' Short with Clip"''). Mention the [[Visometer]] ink level visualization system . {{OnBack|File:1940-Shure-Parker-Wahl-p693.jpg}} | |Note_en=Advertising for two [[Parker]] models: [[Challenger]] and [[Duofold Geometric]] bot in celluloid in ''"Jet Black"'', ''"Brown Pearl"'', ''"Grey Pearl"'' and ''"Green Pearl"'' colors and two sizes (''Men's Long with Clip"'' and ''Ladies' Short with Clip"''). Mention the [[Visometer]] ink level visualization system . {{OnBack|File:1940-Shure-Parker-Wahl-p693.jpg}} |