FUNCTIONS Chronograph with asthmometer (5 respirations) scale / 24 hours indications. CASE / DIAL / HANDS Case: 38mm diameter in 316L stainless steel with reference number (20201), 11.3mm thickness, 46mm lug to lug / Circular brushed and vertical brushed two tones blue colour GLASS Double domed sapphire crystal with five layers of antireflective coating and top layer of anti-fingerprints coating WATER RESISTANCE Waterproof case: 5 ATM / 50 Meters STRAP Leather: vegetable tanned italian brown leather, brown colour stitches. Size (mm): 20/16. The buckle is signed and has an interior brushed finish with reference number engraved (20201.2). This reference comes also with a vegetable tanned italian brown colour with cream stitches, included in the packaging as an extra strap. The colours of vegetable tanned leathers will change over time (natural patina). MOVEMENT Seiko VK64 (mechaquartz with mechanical module). The mechaquartz movements were invented after the Quartz crisis in the late 80's by swiss and japanese brands quite at the same time. In Switzerland, the first mechaquartz was invented by LeCoultre and Piguet. In Japan, by Seiko.