DrStrong
·The gasket was complicated to remove, but fortunately enough had not melted on the dial
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Looks like a sunburst finish and impeccable dial, bezel and hands which would point to a from service parts / NOS, as far as I understand. Nothing wrong with that but it doesn't seem to be something that was sold in the early seventies.
I think you don't want to open a Grand unless you really know what you're doing. My Omega boutique service guy won't.
I would say its put together, like the watchco SM 300.
The case will have a laser engraved Ref nbr on the buttom, your watch doc has to remove the movement so he can see it.
When he does let him write down the serial number on the movement and buy an extract of record from Omega, most certainly it will tell you that it doesn't belong to a 1000m. Furtheron i bet that dial, hands and bezel glow nicely in the dark!
Dont get me wrong, these are all original Omega parts, but Service parts.
I yet have to see an sunburst case that is vintage.
Sorry to be bearer of bad news.