|Note_en=Advertising for the [[Parker 51]] model in both ''regular'' and ''demi-size'' reporting the [[Aero-metric Ink System]]. Mention also the [[Parker 21]] model and the ''[[Superchrome Ink]]''. Published also on the ''Esquire'' number dated 1952-02. | |Note_en=Advertising for the [[Parker 51]] model in both ''regular'' and ''demi-size'' reporting the [[Aero-metric Ink System]]. Mention also the [[Parker 21]] model and the ''[[Superchrome Ink]]''. Published also on the ''Esquire'' number dated 1952-02. |