rear sight question

[powderburner]

my sight is an origional style sold by axtel that they used 32 years ago. it has a dove tail slot in the rear of the elevator that is separate from the elevation block. there is no provision on this sight to lock the eyecup to the elevator, it was sold by C.sharps when they were the Mt. distributor of the rifles.(pre bryan,) Axtel claimed it was dead nuts on reproduction , for the sharps mid range vernier. Tom was like that, I do not know what cheney has but there are sights out there that do not need or have the ability to lock the elevation,
I was under the impression that this sight was used on the Quigley model and was the go to sight in those days ,but memories dim and such . so they may change ,, he just needs to verify that he has a locking sight or not,
probably should take a closeup of the side of the sight before determining just what he has ,