cal. 537/1 nee Lemania cal. 7865NL, as used in the Ref. 8068

used as is in the ref. 8068 and ref. 8067, Lémania caliber n° 7865NL - Breguet n° 537/1

(this calibre is also the base in the Reina di Napoli, with additional work to accomodate the detached power reserve and moonphase)