Breguet

Hi, everyone. I've been following this forum for a little while now. This is my first post. I have a couple of questions, historical in nature, that I hope someone can answer. First: how does Breguet number it's watches? I can't seem to make any sense of ... 

Welcome here, by the way! Best, Nicolas

For the welcome. I guess my questions didn't excite any historians. Do YOU know the answers? :-)