William Smith
Posted August 6, 2015 - 3:21pm
We have several 7AM's w/ the sweep second complication on site. Dr Ranfft doesn't list the 7AM, but he has several 7's listed on his site. Most of those which are "close" to 7AM have a sub second, which can pretty easily be modified to be a sweep second and for what ever reason, the "C" part of the 7AMC wasn't stamped on the bridge for some of these perhaps earlier movements w/ sweep second.
Here's Jab's 1943 17 jewel example from this 1944 American Nurse record.
We also have a 1946 7AM w/ sweep, from this "non-conforming" record, so maybe it wasn't just the older movements which didn't have the "C" part stamped on bridge.
