I think you can assume your watch was serviced by Breguet at some point. The tell tale sign will be if your second hand has a thicker width at the centre (as with mine). The original second hand would have been straight like the photo below shows: Its super rare to find a watch with original hands.
Here is a great reference document that will help you research all things type XX
www.donindiano.net
#type_xx
Enjoy your beauty
Best wishes , Will