Most visitors online was 1660 , on 12 Dec 2020
The 3rd wheel meshes with the 4th wheel pinion, not the center pinion, so I'd bet real money the sweep seconds wheel is the same size as the 3rd wheel.Obviously it’s ‚just’ a matter of finding a wheel of a correct diameter and number of teeth. The hub is easy for any good watchmaker - much easier than a balance staff for example.
The wheel will be wider than the 3rd wheel of the movement, because the second pinion is much smaller than the center pinion. But it probably has the same number of teeth (od can check if the pinions have the same number of leaves.
Telling by what I think is a circular mark made by the wheel on the bridge, probably the wheel was bent and someone removed it. Maybe it broke during straightening, we’ll never know...
Yep. I went through a bunch of pillar plates from parts watches last night. Later 16s Elgins sunk the 3rd wheel into the pillar plate, as did the 13/0 wristies. But still, they're always smaller than the sweep wheel. But boy, on those 13/0s, is it close!Yes, but that depends if the 3rd wheel is close to the dial side, somewhere in the middle or over the center wheel. All three options were used often by the designers.
Also the 3rd wheel does not need to be so large to reach the center arbor, so it usually isn’t. Of course, in small wristwatch calibers the difference will be less noticable, but I think in all wristwatch calibers I’ve seen the wheel driving the c/s is larger than 3rd.
Also, the c/s pinion is usually not much larger (if at all) than the center arbor itself, so even if it only had to clear the arbor, the tips of it’s teeth would be dangerously close to it