Omega constellation 9900 movement

The difference between Omega 8900 movement and 9900 movement

The 2500 movement is changed from the original ETA movement, which is divided into 2500A 2500B 2500C movement and active 2500D movement. It is the movement patented by Omega. The official warranty period is 3 years and the maintenance period is about 5 years. The 8500 movement is made by Omega, with a 4-year warranty and a maintenance period of 10 year.