The way the proof is laid out is like a set of Parker barrels I have that were made in Belgium by Armaf Dagun in the 1950s. Contoller code Q is for Dewild Gaspard who worked 1952 to 1968, I wonder if the year code is a Greek letter (maybe rho) which would be 1958, note that it also has 70mm chambers.

I learn something every day, and a lot of times it's that what I learned the day before was wrong