Sharing this to see if anyone has seen anything similar in any of their clocks. This Ives clock mechanism is circa 1824-1827 and is pretty rare. This "hoop wheel" is certainly different than any I have seen in any other clock mechanism. It is my assumption, perhaps incorrect, that the teeth in the valley(s) of the cam exist for a reason. Why remains unclear to me. Any ideas? Watching the strike stop, warn, and run doesn't offer any clarity as to purpose. Yet, I can't imagine Ives adding this complication just for the fun of it. Times were tough for him as he built these, in between bankruptcies, and possibly in and out of debtors prison in NYC at the time. It is thought he was bailed out by John Birge about 1828, but not documented. And his credit report has nothing to do with this wheel, but I found it interesting and tossed it in.