Speedmaster Moonwatch Professional 42 mm, steel on leather strap 310.32.42.50.04.002 Callum high performance Paraflex shock absorbersWinding: Bidirectional high performance Paraflex shock absorbersWinding: Bidirectional self winding via Perpetual rotorPower Reserve: Approximately 70 hoursDial Color: White mother of pearl 00) combines modern precision with timeless vintage inspired design ) 97 g Calibre Omega 3861 Movement type Manual‑winding Power reserve 50 hours Strap color Black Strap type Leather strap Strap surface Non‑grained calf leather Strap underside Grained calf leather Buckle type Foldover clasp Buckle material Stainless steel and the famous dot over 90 on the black anodised aluminium bezel ring