Is it possible that a ring-top cap-top is a feature added individually, just by replacing the original cap-top with no ring? 1921/22 catalog shows no. 28 pen (that's the same size as the one here?) with a screw-ring so I guess it might just be a little DIY 'improvement'? Or the other way round: a clip added as an extra feature? Is there some special groove or other way for the clip washer that would exclude such possibility?
It is possible that the cap top was swapped out at some point, but this pen is equivalent to a 26 size Jack Knife Safety. I don't know if they have compatible cap tops.
What is the meaning of "6" on the blind cap?
That is a remnant from the Jack Knife Safety days, showing that it was equivalent to a 26, or 6 size pen.
Is that a heart shaped breather hole on page 21 of the Parker catalogue?
Looks like it. Some Lucky Curve nibs have heart shaped holes, but I don't recall seeing another Duofold nib with heart-shaped hole.
The barrel imprint is the same as on the pen?
Isn't your pen missing the "jet black trim" mentioned in the ad ? Or they meant the section and cap-top (the Duofold feature)?
The barrel imprint on mine has the patent dates,etc. The ad probably took a small artistic liberty. The "jet black trim" is the cap top, section, and blind cap.
Edited by BrianMcQueen, 16 June 2017 - 07:38 PM.