Forums Latest Members

Omega 8500 Seamaster Planet Ocean, Amazing accuracy

  1. Unknown Watchmaker Sep 20, 2023

    Flashback to 2020, before the pandemic started. I serviced Omega 8500 and this is one of the best timegrapher results I had so far after working on many Omega 8500 caliber since 2008 or 2009.
    After a few upgrades to eliminate some issues and flaws. It's one of the most accurate watches I have ever come across so far. Thanks to the twin Barrel, coaxial, and silicon hairspring. Hour wheel is still an issue these days and a very rare issue with accuracy related. The only time I have issues with COSC accuracy is when the CH and 9H position is out of COSC spec due to a worn out balance staff, so I have to replace the complete balance wheel to eliminate this issue and and keep all positions in the COSC tolerances range.

    Every after service, I do a few adjustments with an omega tool to regulate the timing screw.

    One of my favorite watches to work on and I have a lot of respect for this Omega movement, nothing more than a state of the art when comes to accuracy with 60 hours of power reserve. I feel that Omega doesn't get enough credit for this.
    Love to know what timekeeping is like now after three years of service. I love to see how it holds up 30 years after that.

    For those who worked on it. What are your thoughts on Omega 8500 accuracy?

    Pip, Aroxx and Dogart1983 like this.
  2. Dimitar Adamski Oct 13, 2023

    Believe or not,my SMP 2531.80 held amazing timekeeping after the service within a second per week.
    Turpinr likes this.