I have removed the diaphragm from the Vacumatic filling mechanism of this pen in order to prevent any outgassing and ambering or discoloring of the barrel. No size marked, but looks like a F and I would say it is a semi-flex. Pen measures approximately 5-1/4 capped and 5-13/16 posted. If you have any questions, just ask! VINTAGE PARKER VACUMATIC VACUFOLD DUSTY ROSE 14K EXCELLENT TRANSPARENCY" is in sale since Saturday, July 13, 2019.This item is in the category "Collectibles\Pens & Writing Instruments\Pens\Fountain Pens\Parker". The seller is "writeagain" and is located in Antioch, Illinois.
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