That tang sight should have a very faint company mark of Lyman, Marble's or Winchester (made by Marble's)
All these sights are very similar, and work the same. You will hear (or should hear) clicks as you adjust the elevation.
If you disassemble to clean, be sure you get the spring back in the same direction! I got a Marble's for $5 because "It was Broken", paid for it and stripped it in the store, reversed the spring, assembled and then owned a $75+ sight!
Lyman is marketing current production Tang sight that externally resemble the originals, but are junk and hold the settings with an O-ring (I use it as a fixed sight, set for one known distance and don't adjust!)
Montana Vintage Arms is currently making modern productions of the original tang sights. As good as or better than the old ones, but cost is $225 verses $79 for modern Lyman!
Ivan
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