Made in France - see the images for some more information from Parker, along with the below 'marketing' text they have prepared: The Vacumatic filling system was developed by Parker in the early 1930s. Ink is drawn in to the pen by repeated pushing of a plunger at the end of the barrel. This flexes a rubber diaphragm attached to the plunger with the partial vacuum drawing ink into the barrel. Ink is held directly in the barrel - the pen does not have a conventional ink sac The filling system was re-designed in 1948, with the introduction of the Aerometric filling system. This filling system operated by pressing a pressure bar on "Pli-Glass" PVC sac. [2] The pen and the ink were both named "51" to mark 1939, the company's 51st anniversary, during which development for the pen was completed (U.S. design patent No. 116,097, U.S. Patent 2,223,541 filed). By giving the pen a number instead of a name, Parker avoided the problem of translating a name into other languages.

Lauren Hubbard. "Queen Elizabeth Has Used the Same Brand of Pens for Almost 60 Years". Town & Country Magazine . Retrieved 10 Jul 2021. From conception to assembly, the attention to detail is second to none. The cap is decorated with a complementary metallic jewel and each finish is inspired by heritage colours of the past, a tribute to the original Parker 51 range. Inspired by the past. Made for the future. This aerometric filling system was used in virtually all 51s until 1978 when production in the UK ceased. Small changes and improvements to the 51 continued almost annually from 1950 on with the major redesigns in the late 1960s with a streamlined Mark 2 followed by the final Mark 3 version in around 1975. A wide range of 51 variations were produced in both the UK and USA with slightly different timelines, and it is not unusual to find different colours, cap styles and imprints in US and UK productionTheParker "51"stayed in production until 1972 with a series of revisions throughout its production cycle. In 2021 a reimagined version of Parker "51" was released. [9] [10] The 2021 model had slight differents with its predecessor, being 4mm longer than the original 51. [11]

The"51"was innovative for the period. It had a number of new design features—in particular the hooded, tubular nib and multi-finned collector were designed to work in conjunction with the pen's proprietary, fast-drying "51" ink. This allowed the tubular nib to stay wet and lay down an even line with either "51" ink or conventional inks. The initial model used a Vacumatic filling system which operated by pressing a plunger to generate a vacuum, drawing ink into the pen. [1] Above: In 1947-48 Parker produced a demi-sized version of the 51 Vacumatic. All parts except for the barrel and cap were identical to the full sized 51. An uncapped Demi is about 11.2cms long whereas the full sized 51 is 12.8cms The Parker 51 Aerometric This initial ink was highly alkaline and while water-based, also included a substantial amount of isopropyl alcohol. wanted’ – retaining its distinctive streamlined silhouette and iconic hooded nib; yet is made for the future – this pen is hand assembled and made from durable precious resin, benefitting from Parker’s expertise and reputation for superior craftmanship. Parker's continual advertising during the war created demand that took several years to fulfil after the end of the conflict.

The 51 was a unique product and shook the world on its introduction. The torpedo shaped design and the hooded nib became icons of style and were copied by virtually every other pen manufacturer. It is no exaggeration to say that the Parker 51 is the most popular, reliable and functional pen ever invented. The original Parker 51 pen was the biggest selling and probably most practical fountain pen ever made. It never leaked, always worked and rarely broke. With sales in excess of 20 million pens, it was ‘like a pen from another planet!’ It rapidly became 'the world's most wanted pen'• Fully serviced vintage Parker 51s for sale The history of the pen is as follows, note that there is inconsistency amongst the experts about the names of the different types of 51, some regard the Vacumatic 51 as a seperate entity and the aerometric is the Mk I, I prefer to follow David Shepherds philosophy as outlined below; The Parker 51 is a fountain pen first introduced in 1941. Parker marketed it as “The World’s Most Wanted Pen,” a slogan alluding to restrictions on production of consumer goods for civilian markets in the United States during World War II. In addition, Parker reformulated its "51" ink, reducing the alkalinity, and introducing a selection of bright colors, and changing its name to Superchrome. Like the"51"ink, it also came with a warning that it should be used only in the Parker51, though this warning was more discreet.