Mechanics 8 min read
How an automatic watch works
Your wrist gives it energy. A spring saves it. A tiny balance sets the rhythm. Follow the journey inside an automatic watch, one pencil drawing at a time.
Certina · DS-7
Ref. C0434073336100
The Certina DS-7 Powermatic 80 Yellow Gold / Champagne / Bracelet takes a 10 mm strap: measure between the lugs and that is the only number you need. We list 2 straps in that width. With a 39 mm case and 100 m of water resistance, a strap of medium thickness keeps the balance. Automatic movement. Most straps here come with quick-release spring bars, so the swap takes a minute and no tool.
Width is a starting point. Check the case and end fittings before choosing.