Bronze develop patina, change of color (stains), oxidation on material are normal. Case Back: Screw-in 316L Stainless Steel case back (sterile). Bezel: Cusn8 Bronze (120 clicks). Bezel Insert: Bronze inlay without Lumed. Crystal: Sapphire glass with AR-Coating. Buckle: Stainless Steel Buckle with PVD gold plating. Water resistance: 300 m / 30 ATM. Luminous: Japanese Super Luminova C3 (Green). Hands: Diamond cut mercedes hands. Height: 13.70 mm. Case Diameter: 40.5 mm (44.7 mm with crown). Lug to Lug: 48.00 mm. Weight: 172.9 g. Lug Size: 20 mm. If there is any. Appreciate your kind understanding.