|Note_en={{Dating|copyright}} Advertising for the [[Parker 51]] model in the new [[Aerometric]] version. Cite two sizes, ''regular'' and ''demi-size'', ''[[Lustraloy]]'' and gold filled caps, starting price at $13.50. | |Note_en={{Dating|copyright}} Advertising for the [[Parker 51]] model in the new [[Aerometric]] version. Cite two sizes, ''regular'' and ''demi-size'', ''[[Lustraloy]]'' and gold filled caps, starting price at $13.50. |