I didn't hear any source between Baume&Mercier and PIAGET. Piaget develops the luxury watches and jewelry. Baume&Mercier creates the classic style. Furthermore, Baume & Mercier founded in 1830, ten years before the Piaget.
With regard to Breitling Small Perpetual Calender, you need to adjust it every four years. Apart from quartz watch, I think there are rare similar watches with the same price. You could purchase it with the 40% discount.