C Feyen

Cfeyen

10 - Canadian Parker Vacumatic TWT Band

Blind cap shape comparison Left Canadian OS Right - Pen in question - more slender with tapered end

9 - Canadian Parker Vacumatic TWT Band

Blind cap length comparison Left Canadian OS Right - Pen in question - Note just a little shorter blind cap

8 - Canadian Parker Vacumatic TWT Band

Jewel and Tassie Comparison Left Canadian - OS Right - Pen in question - Note smaller diameter of tassie and jewel

7 - Canadian Parker Vacumatic TWT Band

Size comparison Top - Canadian 1st Gen Oversize Bottom - Pen in questioin - Note same length, barrel is more slender girth

6 - Canadian Parker Vacumatic TWT Band

Size comparison. Top - Canadian 1st Gen Standard with w/ 14K band Middle - Canadian 1st Gen Oversize Bottom - Pen in question

5 - Canadian Parker Vacumatic TWT Band

4 - Canadian Parker Vacumatic TWT Band

2 - Canadian Parker Vacumatic TWT Band

3 - Canadian Parker Vacumatic TWT Band

Nib is Parker USA - Replacement

1 Canadian Vacumatic thin-wide-thin band

As long as a 1st gen. Cap same length as OS and can thread on 1st gen OS. Top of cap more slender. Pen body more slender. Then the interesting cap bands...