Thanks for the photos and congratulations on a very astute purchase.

Very nice rifle.

Are you aware that those Aldis scopes (often ex-military released to the trade after WW1) with that enlarged front lens cover have a windage adjustment built into to front lens assembly?

If you unscrew the outer cover you will see an adjustment scale, and rotating the front lens assembly with a flat bladed tool ( be careful to avoid touching the lens itself) rotates a prism that moves the windage from side to side.

The disadvantage of the system (shared by the Pattern 1918 sniper sight) is that it also moves your elevation up or down so zeroing has to be done in 2 stages. first lateral and then vertical with the top drum.