Omega constellation series 8500

There is a number on the movement of this watch.

Omega 8500 movement is the core component of the watch. The movement number is the only identification of the movement, which can be used to record the production and maintenance information of the movement, and can also be used to judge the authenticity and performance of the movement, so the movement will be engraved with the number. Omega often uses its own movement, 8500 movement, there will be 8500 words.