I believe the sight is original and certainly contemporary to the rifle, as the 21 was still being advertised by AG Parker (a sort of U.K. equivalent of Lyman and Stoeger in terms of shooting accessories) in 1921.

The No. 22 sight came in at some point between 1921 and 1923, so it was not immediately post war.

I quite like the customising to the stock - very subtle and just what you would expect from a prominent target shooter's collection.

What a lovely find with excellent provenance.

John