|Note_en=Advertising for the [[Parker 51]] model in both regular and ''dem-size'' sizes, and the version with laminated gold cap and barrel called ''Signet''. Describing the [[Aero-metric Ink System]], with the ''[[Foto-fill filler]]'' and the ''[[Pli-glass]]'' reservoir. Mention also the [[Parker 21]] model and the ''[[Superchrome Ink]]''. | |Note_en=Advertising for the [[Parker 51]] model in both regular and ''dem-size'' sizes, and the version with laminated gold cap and barrel called ''Signet''. Describing the [[Aero-metric Ink System]], with the ''[[Foto-fill filler]]'' and the ''[[Pli-glass]]'' reservoir. Mention also the [[Parker 21]] model and the ''[[Superchrome Ink]]''. |