This catalog (Jan 1, 1889) shows a cocking rod gun with side pivot top lever. It also mentions the 3 position safety & the top lever being held over by a latch. I will have to look for certain, maybe tomorrow, but am quite certain my side pivot rod cocker has only a 2 position safety & as I recall the lever goes back to center as the gun is closed, being cammed open by the rib extension on closing.
I was correct, my gun, SN 10,515, does have only the two position safety & the top lever does come back to center when the gun is fully opened, no hold over latch. The lower surface of the doll's head is cut on a radius which cams the lever over to the right as the barrels are closed. The extractor is not secured. The track in the bottom of the rib extension in which the extractors ride seems to be cut with a slight taper as it nears the outer limit which provides tension to prevent extractor falling out, but it can be grasped & pulled out against this tension with no tools needed. It has all of the compensating features of these early Lefevers. If there are any other details anyone would like, just ask & I will try my best to provide an answer.
PS; I will note my gun has the smooth concave rib as pictured in the gun drew showed with the proof marks. The rib marking reads Lefever Arms Co Makers Syracuse NY rather than patentees & reads in the opposite direction than Drew's example. The 1889 catalog states all guns unless otherwise ordered will be supplied with a matted rib. There are no proof nor barre;makers marks which I can find, either top or bottom. I have a two hook gun with a GL bbl makers mrk & some large hook guns with SBL&Co marks.