Ristola was a microbrand founded by Bryan Duszak in 2017. The company claimed to be located in La Chaux-de-Fonds, Switzerland. It launched an unsuccessful crowdfunding campaign on Kickstarter to manufacture a 24 hour diver watch called Plongeur UTC.

The planned specifications were:
  • COSC certified ETA 2893-2 UTC (24 hour time) automatic movement
  • 43mm stainless steel case with screw-in crown
  • ISO 6425 certified water resistance of 300 meters
  • Automatic helium escape valve
  • 120 click rotating ceramic bezel
  • 3.8mm domed sapphire crystal with internal AR-coating
  • Lume dial
  • Dual time zone and date complications
The announced retail price was $3,249. The crowdfunding campaign was cancelled on January 24, 2017. It is unknown if the company manufactured the watch.