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BSA No.9 on the right by the look of it.

https://www.milsurps.com/images/imported/2024/02/BSANo9cAD1909-1.jpg

Was one I sold years back. Came out of a large box of remainders from a long-standing but long-gone local gunsmith. The sights were clearly the residues of his having made sporters out of pre-WWI...

Another unknown?

Spanner adjustable I see! :D

If that information is anywhere it is probably in the NRA archives. The NRA Museum is probably a treasure trove of information, but I have the impression they survive on a minimal budget and with...

Definitely Humphreys; had one very similar so marked. He is said to have made the first sight bridge for the Ross Mk.II as well. Early sights were very much "hand-made".

Here's the "arm" for...

I see you've got an early Humphreys sight there, left drawer back center: https://www.milsurps.com/attachment.php?attachmentid=52950&d=1400495572

I found the arm of a better and later version...

Wasn't he the chap who came up with the aperture sight mounting bridge / charger guide for the Ross MkII or so they say? I believe he was a Cowichan; best known for their sweaters!

I used to have...