This C1 Biretrograde is presented in a 44 mm 18K rose gold case, standing 14.60 mm tall. A metal protective ring coated in black rubber and fixed laterally by 7 self-blocking screws is enhanced by eight decorative elements straddling the bezel. These bastions protect a spectacular 3.30 mm thick sapphire crystal, which literally emerges from the case. The black skeletized dial reveals a mechanical, self-winding La Joux-Perret movement offering a 42- hour power reserve, a retrograde date indication between 3 and 6 o'clock, a retrograde day indication between 6 and 9 o'clock. It is presented on a black rubber strap with folding clasp in 18K rose gold and is Water-resistant to a pressure of 5 ATM.