Inherited Omega- Store couldn’t tell me what model!

Hi All,

Was wondering if you could help! I inherited this from my grandfather, never met him unfortunately. Been trying to find out more about this watch but the store couldn’t tell me even the model! They pointed to some similar photos in their archives but none had the diamond hour markers. I’m sure there is more knowledge here 😀 They pointed that it might be an Asian exclusive or custom order?

Any help would be greatly appreciated and I guess feel closer to my grandfather!