Nice.
Generally Canada is considered to have made Vacumatics routinely through 1953. Some even later dated parts/pens have been found, sometimes in the style of Canadian vacs but with USA markings. It gets tricky.
Thanks for sharing.
regards
david
David R. Isaacson MD. Website: VACUMANIA.com for quality old pens with full warranty. Email: isaacson@frontiernet.net