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The first year Parker 51 pens are double jewelled, having aluminium jewels on the cap and the blind cap.

However, from 1942 the jewel was removed from the blind cap on the majority of production, and double jewelled pens became far less common.

Parker 51 Pens for Sale The Parker 51 pen was launched in 1941, was very popular through out its production, and can still claim the highest sales volume of any fountain pen.

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The difference was that the previous button was replaced with a fat (approximately 4 mm) plunger that was used to operate the diaphragm.

The plunger could be locked in a down position with a twist of the thumb And is referred to as the Lock-Down Fill, or Twist-Fill.

Jump to summary chart For those of us concerned with when a pen was made, Parker is the sweetest of all makers, in that many of their pen actually have a date printed right on them.

Not only the year, but which quarter of the year, will appear, giving a very clear sense of just how old the pen is.

This practice was evidently started as a means of helping quality control (“What was it exactly that we changed between April and June of last year that made the pens catch fire? While modern Parkers that follow this practice mark only the barrel or cap of the pen, vintage pens generally have a code on the barrel and on the point.

One generally takes the barrel as definitive of the age of the pen as a unit, since caps, barrels and blind caps were usually all made together, and swapping tends to show.From circa 1942 the jewels were also made from a pearlised plastic.At the same time Parker also replaced the metal Speedline version of the Vacumatic filling system with a plastic Vacumatic filler.ITEM #5429: STANDARD SIZED PARKER VAC, BLUE LAMINATED. Not the usual weapons grade stiffness typical on Vacumatics. Double jeweled, triple band, Medium 14K nib and a super clean (uncorroded) lock-down filler. Medium nib has a suprising amount of flex for a Vac nib. 0 ITEM #5253: PARKER STANDARD SIZED LAMINATED VACUMATIC. 5.275" long ( 134 mm) x .598" diameter @ cap bands (15.17mm). This has a rare clip in that the back end is flat, with no feather impressions.

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