Rear Sight Variations???

[sheepherder]

I've been here five years and have followed artillery rear sight postings closely, but have not seen this before...

A member posted pics of an artillery rear sight in another thread [first pic below] which I identified as being mis-assembled/modified. I posted pics of two rear sights I had lying in front of me [second pic below] in support of this claim. Am I wrong??? (Hey, it happens!)

Now I see a Luger artillery rear sight on GB that is different from all of these [third pic below]...

Besides being fine tune, are there other variations of artillery rear sights???

Can any of these be from something else???

Some have the elevator button on the rear side, and no 'clamps' on the elevator...And the third one has 'scallops' on the sides of the leaf that the non-fine tune does not have...

Did the different manufacturers [2?] have different shape/style rear sights besides fine tune??? Did different years change the shapes/styles of the sights???