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The same year the additional logo with the arrow through a circle was added to the cap, aka the "halo" logo, while the Demi Parker "51" was discontinued.

The places where the pen was test-marketed included Caracas and Maracaibo, Venezuela; Barranquilla, Columbia as spelled by Parker in their ads ; Port of Spain, Trinidad and Tobago; and Curacao, Netherland Antilles.

The filling system was instead moved to the Parker 45, introduced in 1960.

The MKII Demis had chrome-plated aluminium fillers identical to the larger verisions with the imprint "To fill press ribbed bar firmly 6 times.

In 1955, a matching 51 Jotter ballpoint was introduced, along with the so-called Liquid Lead pencil -- a nonretractable ballpoint using a graphite slurry.

I find p51s don't especially love it.

Parker also manufactured 51s in Canada and England, and later in Argentina.

When the plastic proved too fragile in real-world use, engineers replaced it with red-anodized aluminum.

Matching pencils and desk sets were offered throughout the 51's production run.