![Quote](images/misc/quote_icon.png)
Originally Posted by
RedsBluesGreens
gbav8r, welcome to the forum - it's great to have you here, and thanks for joining us! What ALT1 model do you have?
As I'm sure you know, the 'big' issue with mechanical watches generally is magnetism - that can easily cause big variations in timekeeping, as the hairspring becomes 'stuck' to itself as it unwinds, creating a shorter spring and thus a gain in time. Aside from that, as you say, a lot of issues can cause issues - temperature, knocks or vibration to the watch, even laying the timepiece in a certain position (crown up, down etc..) is known to influence the timekeeping.
Bremont have done well to limit many of these issues using faraday cages and shock mounts in models like the MBII, but not all models in the range get the same full treatment. Obviously, with the COSC (now ISO 3159) standard to which Bremont conform, anything wildly outside of -4/+6 seconds/day is a good indication something is wrong, and it should be looked at.
Hope this helps.
J.