Help identifying this vintage Omega

Hi all,

I would appreciate any help in identifying this watch. It belonged to my grandfather, who was an RAF pilot in WWII. As far as I can tell, it's closest to an Omega Techron based on the lug design and inner 13-24 hr numbers. However, I cannot find any examples of a Techron with a silver dial. The case back is blank and I am not confident enough to pry it off!

It's hard to tell but the second hand is blue, the minute and hour hands look like they could also be, but they have corroded.

It works but runs fast so I would love any advice on who to take it to for service/ repairs in London?

Thanks in advance.

I would avoid opening the case. The lume on the hands is almost certainly radium... Perfectly safe unless you open the case and inhale / ingest any dust.

Thanks for your thoughts. Unless anyone thinks otherwise it sounds like it must have been redialled at some point. I'll look for somewhere to repair it and maybe they'll be able to tell me more from the inside.