Parker 51 aerometric dating sites Webcam adulti gratis
The Parker "51" commonly referred to as a "First Year" pen is really a pen from late 1940 through 1941.
They can be easily distinguished from later production by several unique characteristics.
In addition, I have been able to inspect a demonstrator with the "1" imprint by the clutch ring and a rounded blindcap.
Dating of Parker "51" pens is easy, down to the quarter it was made; at least for the barrel.
Some of the war year clips show a silver base instead of brass, and seem to be extruded instead of struck, were you no longer see a negative image on the back of the clip. The blue diamond color is also a darker blue and smaller in size.
The blue diamond clip was discontinued in mid 1947 due to a ruling by the FTC against lifetime warranties, but was probably fitted to later pens as supplies allowed.
I have only seen 2 such pens, the second one dated 1944 and on a cordovan barrel, which has the tell-tale Parker-font factory engraved name on the barrel.
Probably an experiment by Parker, most likely given to employees to test.