AMSEC CE1814 with S&G lock
I expect the lock is a Sargent & Greenleaf, model 6630. It behaves as if it has false gates on one or more wheels. The lever nose likely has the eccentric roller, which complicates study of the contact points. I am almost completely unable to find the left CP, and have given up trying. The right CP readings are inconsistent. One must read multiple times, and record either a min or a max reading.
The dial requires a delicate touch. The action is quite smooth, with little to no play. However, the nose roller will easily go past the CP with virtually no feedback. The dial and ring are shiny chrome, with black indices. It does not help me see the markings, and stray reflections from ambient lighting are a constant nuisance.
Despite the challenges, I've reassured myself the right CP *can* be felt. As long as a CP can be found, the wheel must be able to be traced. I've completed the graph of the first number. I am confident the third wheel in the pack is set to 50. I'll continue to work on the next number over the weekend.