PPco Scope unknown mount

[skiprat]

this scope has BSA provenance,
I wonder if BSA "tried it out " so they could use the pattern 1918 as well as the Aldis, but due to the low numbers of rifles produced it came to naught , the mount is a lot of machining to fit to the eye piece belling out, a lot more when compared with the Aldis mount

[303 Collector]

I have a BSA Mk111 rifle with an Aldis 4 scope and the same mount system.
I got it at the Bisley arms fair about 12 years ago.
I have often wondered about its history.
Is it a genuine BSA made rifle/scope system?
Or a later put together from parts?