Watch made of stainless steel, polished and brushed surface, with sapphire glass and semi-matt white dial, decorated with white zirconia. Chronograph function. Water resistance 50 m. Movement Miyota. The Sif Jakobs Watches are made of 316L stainless steel cases and bracelets, meaning they are hypoallergenic. All watches have sapphire glass which is a type of watch glass that is incredibly hard and therefore durable. Sapphire is considered the best material to protect the watch dial against shock. We use MIYOTA Japanese movements in all our Sif Jakobs Watches. MIYOTA’s battery lasts 4-10 years depending on the model. The gold plating on the Sif Jakobs Watches is IP/Ion plating (0. 5MIC TIN + 0. 1 MICAU (1N14)).