Hello everyone. I brought home an Atmos clock yesterday. I believe it is a 519 from 1953. I started it up and, so far, it seems to be running well and keeping good time. I have two questions. What should the balance amplitude be on this caliber? I saw a video of a different caliber Atmos where they said the amplitude, after service, should be between 360 and 540 degrees. The amplitude on my clock is about 315 degrees. Does that suggest mine needs a service or is that fine for a caliber 519? My second question has to do with the bellows housing. I understand these are dated inside the housing. I'm curious about the date but am wary about removing it just to check a date. Are there any inherent risks? If it is relative safe, what is the proper way to remove the housing? Thanks!