One thing's for sure, when discussing Lee Enfields, a seemingly simple question can often come up with some interesting findings.
I will see if I can go back and edit my previous posts, to clarify that my data may not apply to all 800 yard sights.
The sight I got on e-bay will have a lot of friends around the world, the vendor was offering them in job-lots of up to 5 or 12; with the occasional whole box on offer. If it is one of an obsolete pattern, and had been sitting unissued in store somewhere, that would help explain why it looks so shiny and new.