I have ultrasonically cleaned the NIB, feed, collector, breather tube, hood, and barrel. Replaced the old diaphragm with a new one. Hand cleaned the Cap & Arrow Clip, Clutch Ring, and 14K Parker NIB. This Parker 51 is Fullsize and measures 5 3/8" capped and 5 7/8" posted. There are no monograms or personalizations to either the cap or barrel.
This fountain pen cap, barrel, and hood are in great condition with no chips or repairs. The barrel, hood, and blind cap are very clear. The cap has the Feather Arrow Clip that displays no wear. The cap is a Lustraloy type with no denting. The cap is clearly stamped with, "PARKER" on the lip of the cap. The barrel is stamped, "PARKER "51" MADE IN USA with date code 8 (for 1948) in the 1st Quarter".
I have replaced the diaphragm and tested the Vacumatic filling mechanism with water and fills as it should. The filling system, typically in my tests with water, will fill nearly full in roughly 10 to 14 presses.
The Parker NIB is 14K and is properly dated 1948 making the nib a marriage to the rest of the fountain pen writes. The actual writing portion (iridium) of the 14K Parker NIB has a medium point measuring roughly .65mm when measured with digital calipers. When writing a sample with this NIB, it writes with a fine to medium line ranging from .53mm to .61mm when measured with digital calipers. The writing sample was done with the actual pen in the images that are listed for sale. The writing sample was used by dipping the NIB in Parker Quink Blue-Black Ink.
This Parker 51 Demonstrator Fountain Pen is uncommon being it is a Parker factory-made fountain pen - there are a bunch of "fantasy" Parker 51s demos out there, this is not one of them. I would consider this Parker to be in Excellent Condition. Certainly a collector grade addition to one's writing arsenal collection that is ready to write with.
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