Early 30T2 model?

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Hi friends.

I have an early 30T2 in 9.3 mil serial number. It has a waterproof case with screw in case back and all printing are on the outside of the case.
I have searched online and found some of them but still don't know if there was a name for this kind of early Omega waterproof watches.
If you know, please advise.
Thank you.

Hoi.