Who needs numbers when you can use colour? This colourful watch uses three rotating discs to show you the hour, minute and seconds. The discreet white line on each disc, tells you where each hand is pointing and so reveals the time.Cyan: hour handMagenta: minute handYellow: seconds handWhere the discs overlap, new colours are formed, creating a constantly shifting palette of colour.The Colour Venn watch is powered by a beautiful Swiss-made automatic mechanical movement, which is visible through the glass exhibition case back. This means it doesn’t have a battery. Instead, the motion of wearing your watch provides the power to wind it up and keep it running. Details Size: Large / unisexMechanism: Sellita SW200 Swiss made automatic mechanical - this means the watch has no battery, instead it's powered by your movementGlass: sapphire (hard-wearing) + mineral glass case backCase: 316L silver stainless steelDial: Light matte silverWidth (3 o'clock to 9 o'clock): 40mmHeight (from lug to lug): 50mmThickness: 11mmWaterproof: Yes! 5ATM (leather will wear fast when exposed to water)Guarantee: 12 months (any problems after, we’ll be happy to help!)Strap: 18mm black leather with black stitchingSmallest strap diameter: 150mmLargest strap diameter: 205mm