|Note_en={{Dating|back}} Advertising for the [[Parker 51]] model citing 7 new colors aside the black and 14 advances as the [[Aero-metric Ink System]] (called [[Foto-fill filler]]), the [[Pli-glass]] reservoir, and the new clip [[Live-metal]]. Mention also the ''[[Lustraloy]]'' cap and and ''demi-size'' version. | |Note_en={{Dating|back}} Advertising for the [[Parker 51]] model citing 7 new colors aside the black and 14 advances as the [[Aero-metric Ink System]] (called [[Foto-fill filler]]), the [[Pli-glass]] reservoir, and the new clip [[Live-metal]]. Mention also the ''[[Lustraloy]]'' cap and and ''demi-size'' version. |