Well, finally crossed one off the list...

[Surpmil]

That's a beauty alright. Very rare to find the sight cover still in place. This is the regiment the disc is marked to: https://en.wikipedia.org/wiki/8th_Ca...ess_Louise%27s)

Considering how crisp the stampings in the stock are, the way the disc sits proud of the surrounding wood surprises me. Usually you see that when the stock and markings are heavily worn or sanded, but I doubt it's anything but original. The sold out of service marks are common on these.