The short answer is "no worries". Breguet is one of the few watch houses that is unequivocal in its promise: it will service any Breguet watch made at any time in its history. That is a big commitment and undertaking since that takes them all the way back to 1775 when Breguet opened his workshop on the Quai de l'Horloge in Paris. So you will be assured of service.