WW1 'Periscope Prism company' sniper scope???

[lmg15]

Promo, many thanks for that - very much appreciated. I am away from my main non-cloud computer, but as I recall:
Aldis scopes
1. Model such as No.1, 2, 3 or 4
2. date
3. serial number of scope on the ocular cone for No.1, 2 and 3 models.
4. serial number and date on the objective lens group for No.4 scopes
5. rifle serial number engraved on the tube
6. whether fitted with standard objective lens group, or windage prism group
7. style of elevation turret. No,1 and 2 are low and flat, No.3 and 4 higher.
8. Which way the set screw is pointing - forwards or rearwards. This may not mean much.
9. Graduation range on the elevation drum (based on Rogers comments above)
10, mounting system, eg, Purdey, H&H, PPC, etc. Sometimes a bare scope can give an indication of what mounts used to be on it.
11. Case details. There was a pretty standard leather case with rifle serial number and broad arrow for most Aldis scopes, but the overbore type of 1918 must have used a broader case to accommodate the longer claw mounts.


Sometimes the scopes can be a bit of a mix, as major component groups were interchangeable to varying degrees across all four models.

My recollection of the PPC scopes list headings is a bit shabby, but I will have to get back to the forum on that.

Thanks again for your kind offer. Hopefully some patterns will emerge for everyone's enlightenment. ATB, Damien