Aldis Scope Elevation Range Dial - Bottom Half Help

[Surpmil]

It's not that large a field of study Hatrick.

This is the commercial type of Aldis I referred to. Mind you, I recall the one I owned had a cruder drum and locking system than the wartime models, and certainly more so than what you have there.

Early models had a single piece drum without slipping scale, later examples such as this pristine 1916 dated one that turned up on eBay.de, had the slipping scale.

Your markings are a bit of a mystery: one scope fitted to two rifle simultaneously? Two different types of ammunition?

Anyway, that drum/knob in your first photo I don't recognize unless it is the slipping scale type from which the scale has gone missing, but even then the knurling is not typical. Might be the remains of a commercial variant of the slipping scale drum, but usually the gunmakers simply removed the existing markings and re-engraved as per your other photos.

In some cases the later pantograph engraved markings were perhaps a bit to deep to remove and have enough metal left, so new scales or entire drums if of the one-piece type were made, but overall these firms spent as little as possible on a job.

Your scope has had that brass ring added behind the drum saddle possibly to cover the saw cut or chisel mark(?) visible where some clod removed the original rings.

I doubt any Aldis No.2 such as you have there ever had 1000 yard markings so no point considering that idea. And from the straight knurling visible, the 1-10 scale you show below your No.2 scope is apparently off the partial ring in your first photos? Best left together IMHO. Until you've got H&H mounts ready go back on that scope I would leave the drum alone.