Cartier Ballon Bleu de Cartier Moon Phase — Ref. WSBB0021 Round stainless steel case, 37 mm, steel bezel, sapphire crystal, silver dial with moon phase complication. Automatic movement. Matching stainless steel bracelet, stainless steel clasp. Second-hand, with slight minor scratches visible on the case, bezel, bracelet and clasp; no other damage observed. Purchased in March 2019, manufacturer’s warranty retained.