T here was also a French version produced with an 18k gold nib, it's sometimes referred to as the Lady AF Duofold, since it's thinner and more elongated. This was also offered in an attractive colour of
     Royal Blue

Another similar line was also produced in France during this time, Parker La Plume.

The Senior, was also introduced in 1948. This followed the UK Duofold AF line, only it was bigger.

The Duofold line was changed again in 1953 when a version of the aerometric filling system from the Parker 51 was fitted. The pen, called New Duofold, became slightly shorter and the blind cap vanished. The cap band remained unaltered. Colours were:

     Black
     Red
     Blue
     Green

Also a new, shorter model, the Demi Duofold was introduced in 1953. It was closely followed in 1954 by the Senior Duofold.

 

In 1956 a cap actuated ballpoint with plastic cap and barrel was introduced at £1.05. Early Duofold ballpoints had a plastic barrel with threads at one end with a metal nozzle at one end and a metal collector at the other. The cap screwed on to the connector. But by the time the Duofold ballpoint was mass produced it was redesigned with a simpler one-piece barrel that sported a pushfit metal nozzle tip and screwed on directly to the cap.

In 1958 both the Demi and the Senior were discontinued. The very large Maxima was introduced with the aerometric filling system. And the same year a smaller sized pen, the Lady Duofold, this had a hooded nib.

It's not always easy to spot the differences between the models of the European Duofolds but some of the nibs were numbered to denote the model:

#4   = Lady
#5   = Slimfold
#10 = Junior
#15 = Demi
#25 = Standard
#35 = Senior
#50 = Maxima

Late in 1961 two new standard sized models, the Parker "17" and the Parker "17" Super were introduced (ca 137 mm, closed). They was the first pens made in Newhaven to be produced with the new manufacturing process of injection moulding. They were simple economy pens with slip-on caps. The lower priced Parker "17" had a thin cap ring, while the Super "17" had a wide cap band. Ballpoints were also offered to match the fountain pens and pencils of both models. Both had a slip-on cap, as opposed to the rest of the European Duofold line of the 1960's. They also sported a new style clip with more tapered feathers. The early models also had an open, beak-shaped 14k gold nib. The ends being wider and more pointed than later models, not unlike the Danish Parker Popular of the 1950's.They were offered in the four standard Duofold colours of the time, Black, Blue, Red and Green. These pens also sported metal cap grip-rings on the body. Twist-operated pencils were also offered.
They replaced the Standard Duofold, which was discontinued.

In 1962 one of the best sellers from the British Duofold line, the Slimfold was introduced together with a smaller version of the standard Duofold, the Junior, The Parker "17"', the Slimfold and the Junior all sported a thinner cap band (app 1 mm) but it was still engraved in the same manner as the cap bands on the earlier pens.

Like the rest of the British Duofold collection of the 1960's they came in the four solid colours of Black, Red, Blue and Green, the green being the most uncommon. The Slimfold was 113 millimeters long and had a small gold nib, a gold plated arrow clip with the feathers being very narrow, and also a narrow gold plated cap band with engraved chevrons. Regarded a ladies pen it's an excellent writer with the modified "U" aerometric filler.

The Parker "17" and the Parker "17" Super both initially had open nibs but in 1964 the nibs on both models became hooded, although for a time they were offered side by side. They were not tubular in the manner of the Parker "51's", but still hidden under a plastic lip. The same year a Lady "17" was introduced and the "standard" Parker "17" was now referred to as the Model "17".

The Duofold line in 1964:
     Super Parker "17" with enclosed nib
     Parker "17" with enclosed nib
     Lady Parker "17" with enclosed nib
     Super Parker "17" with open nib
     Parker "17" with open nib
     Maxima
     Junior
     Slimfold

They were offered with matching pencils and Jotter ball pens.

In 1967 a high end Lady Duofold was introduced with rolled gold cap and barrel, the Lady Insignia.

The Lady Standard was introduced in 1968, It was very similar to the Lady "17", but had a longer section. The same year the cap and clip was redesigned on the Lady, Slimfold and Junior, it was now much straighter and sported a Parker "45" style clip. Also in 1968 Parker gave up on the Eversharp sub brand and all the unprofitble Eversharp models were discontinued, the Challenger, Big E, 10,000 and Reporter. Instead Parker introduced a cheaper metal-capped version of the Parker "17", the DeLuxe. They were offered either with chrome or gold filled trim. The GFT-pens also had gold nibs, while the CT-pens had cheaper steel nibs. Later also a custom version with a gold filled cap and trim was introduced. Interestingly enough the at least the CT-version was produced in France and the parts, save the nibs, can not be interchanged.

In late 1971 the Slimfold was redesigned yet again, maybe only to confuse latter day collectors. It now became very similar to the Parker "45", so similar in fact that it's kind of hard to differentiate between the two. The New Slimfold was 122 millimeters long with the cap on, as compared to the Parker "45" which was 136 millimeters in lenght. It also had the Parker "45" nib assembly and clip and since both pens are cartridge fillers the most significant difference is the screw-on cap of the New Slimfold, as opposed to the slip-on cap of the Parker "45".