Alpina Chronograph AutomaticChoice of 4 colours.

• Tap centre to change colour
• Tap bottom dial to start/stop stopwatch
• Tap top dial to reset stopwatch

UPDATE:
Forgot to mention, it’s very easy to change the four colours in the Watchmaker App.

Simply

• open the watch face in the App
• choose the colour you want to change by tapping centre of dial
• tap customise
• tap on the colour you want want to change (layer 1,2,3 or 4)
• scroll down to tint and select
• change colour as desired and tap tick
• go back and set watch face again and you’ve got the colour you’ve chosen