Hi i wanted the know the differance between the senator Perpetual Calendar models 39-50-02-12-04 with movement caliber GO 3950 and 100-02-04-02-04 with caliber GO 100, one has a case size of 39.3mm and the other 40mm, the movements look slightly different...
. . . with the cal 100 being the more modern and advanced of the two. I have three cal 39 perpetuals in my collection (and at one time had four), and there are many owners of cal 100 perpetuals that participate on this forum. Both movements are exceedingl...