Glashütte Original

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. Can anybody tell me what the difference in the movements are and why they changed. Was it just about making the case size larger and adapting the movement to the larger case size and slightly altering it in some way. Or is there some major difference in the movements and watches. thanks Chris

. . . 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 exceedingly competent and well made. Here are links to articles of both:

glashutte.watchprosite.com

glashutteref.watchprosite.com

The one significant operational difference is there have been instances of a 'sticking date' with the cal 39 that can occur if the movement isn't properly adjusted. This problem occurred with my first cal 39 perpetual, and was resolved under warranty; none of my other cal 39 perpetuals ever exhibited the problem. I've heard of other cal 39 perpetual owners with the same problem, but never from the owner of a cal 100 perpetual. My guess is that the broader torque curve and deeper power reserve of the cal 100 makes final adjustment less critical than with the cal 39, so it's more likely to not be affected by a lack of power at a critical transition.

Cordially,

Art

I have the Cal 100 Per Cal and no sticky date issues.