Parker - No reserve price - Pen

As I understand it, this is a quite rare fountain pen dating back to approximately 1920.
The barrel and cap are made of BHCR with a herringbone design. The nib is in very good condition and is marked “PARKER Pen Canada 2” and it writes extremely well.
The barrel is marked “George S Parker Fountain Pen Patented Made in Canada”.
The Cap Ball-clip is marked “PAT SEP 5 16 PARKER”.
This is a button filler which takes up a reasonable supply of ink. The small end-cap (for the filler) is slightly discoloured which is a consequence of its age!