jim vancouver
409
Looks like December 2006 …
… according to this source.
https://translate.google.ca/translate?hl=en&sl=fr&u=http://www.lacotedesmontres.com/Breguet-Collection-Marine-2006-No_5902.htm&prev=search
Actually, I would prefer to do a full service at the manufacturer because they are more likely to have the parts and know how.
What bothers me is not knowing how often the tourbillon needs to be adjusted. The chronograph complication by itself is pretty solid.
And, it is unclear how much longer parts will be available for the 554.2 components not shared with the 554.3,