Sounds like a Lyman 2A. The small lever was just to lock the staff in an upright position. This sort of sight brings about $150 or so. I think if you look real close you will see that it is marked Lyman and has patent dates. If it had windage adjustment there would be a small Knurled knob on the side of the sight, down by the base. Many rifles had no other windage adjustment other then to drive the front sight back and forth. This was probably more of a hunting rifle, so windage would not have come up that often. Back in the day most target rifles had the windage adjustment built into the front sight. Again you would see a small knob or a tab which would be used for adjustment.