First generation Eterna Kontiki super 130 IPT help needed

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Hello all Eterna lovers !
I just bought a not so common Eterna super kontiki diver
Aka “white snowflake”
I’m trying to find out what lugsize this model have , the case is 37mm. I’m looking for an original gay freres bracelet and need to know what bracelet size I will look for.
And one more question , are all Eterna super kontiki bezels “turnable” ?