Dating parker vacumatic pens
When one thinks of the vintage Parker 51 pen, one generally has in mind the Aerometric Mk1 as illustrated below with the short arrow clip and rounded end to the barrel.This model, with many variations, was in production in the USA and UK from around 1948 to the late 1960s In 1969, Parker UK introduced the Mk2 which is most easily distinguished from the Mk1 by having a squared off end to its barrel and a Parker 61 type clip. The Mk1-3 classification of the Aerometric 51 is useful as a guide, but is a great simplification as design changes, driven both by technological improvements and the need to reduce production costs, came about throughout the 51s production period.
It has been assumed that Parker began marking some of their pens on the trim or cap bands to allow for dating in 1970.
Using the words "Quality pen", one letter per year, followed by a quarter marker, allowing for dating within a ten year span.
In 1894, he invented and patented his "lucky curve" feed system, which greatly reduced the leakage that was a common problem of early eyedropper fountain pens.
By 1905, Parker’s Lucky Curve pens were a force to be reckoned with in the growing fountain-pen industry. Its cap could be screwed down to the pen’s body, making it ink-tight.
This pen is identical in construction to the Duofold - eventually, Parker included Jade as part of the Duofold line.
complete w/ box, Spanish Treasure Certification Papers with raised seal, Certificate of Inspection and Warranty, flawless box, converter, nib adjustment tool, three original ink cartridges (these may be dry), and pen with original clip tag, Parker Vacumatic Desk Pen, brown pearl, 1941 date code on barrel, 1940 date code on nib, 7 1/16 inches tip to tip, smooth Fine faintly flexible nib, speedline mechanism is clean & springy, blue diamond model w/ crisp imprint, blue diamond etched on end of speedline filler, unrestored, Exc , Parker Vacumatic Desk Pen, black, 1941 date code on barrel & nib, 7 1/2 inches tip to tip, smooth Fine faintly flexible nib, speedline mechanism is clean & springy, blue diamond model w/ crisp imprint, blue diamond etched on end of speedline filler, restored, Exc , Parker Vacumatic Desk Pen, grey pearl, 1939 date code on barrel, 7 inches tip to tip, smooth Fine med flex two-tone nib, speedline mechanism is clean & springy, blue diamond model w/ crisp imprint, blue diamond etched on end of speedline filler, restored, Exc , Parker 51 Set, 1948, Cordovan Brown, flawless gold filled window pane (Heritage) caps, initials "M. W." on backside of capband, pearl jewels, pencil appears unused, M nib, both pieces working, Exc , 0, Parker T-1 Cap-Actuated BP, c1970s, 5 1/8 inches, late model T-1 with gold filled cap crown, original refill is dry but is included, working black Parker refill also included, BP is working, boxed w/ papers, Mint, 5, Parker Jack Knife Safety, black chased hard rubber, c1920, 4 1/2 inches closed, Fine slightly flexible Parker Pen nib, excellent color & chasing, excellent Jack Knife Safety imprint on cap, excellent barrel imprint, restored, Exc, Parker Pen Portfolio, c1970s, holds 5 pens, case is in terrific condition - exterior is perfect, interior shows only slight signs of use - no stains or anything of the sort, perfect for Parker 51s, pens shown above are not included.
Jade pens made out of a branded plastic called Permanite were sold in a variety of sizes (Junior, Ladies, Senior) and in sets with matching mechanical pencils.
Some Duofolds had pearl handles and caps, veined with black plastic.
Since production was overlapping examples exist with either the imprint 28 or .8. Also, since this coding system extended over a decade, a pen marked 38 could be produced the third quarter either in 1938 or 1948.