|Note_en={{Dating|guess}} stands for '20s. Advertising for a [[lever filler]] model called generically [[Swan Pen]] and an economic model called ''[[Merle Blanc]]'', french analogous of [[Blackbird]]. | |Note_en={{Dating|guess}} stands for '20s. Advertising for a [[lever filler]] model called generically [[Swan Pen]] and an economic model called ''[[Merle Blanc]]'', french analogous of [[Blackbird]]. |