Quote Originally Posted by Claven2 View Post
It's probably Canadianicon as well. The MkIII and CMkIII underwent some minor changes that didn't change the designation, aperature hole size being one of them.

A Mk2 or Mk3 sight is appropriate for a 1944. A Mk1 sight, while superior on the range, is not really correct.
To add a little:

Just remember that all of the MkI, MkIII series sights were originally issued with the small apertures.

IIRC it was a post-war Britishicon project to ream the sights "battle apperture", most (all post-war?) of the Fazakerly ones will have been produced with large apertures (actually I somewhere have a copy of the post-war Canadian instruction where it says that all new sights will be so reamed, but old ones are to be left alone).