That's very nice. It looks all original & the case looks like it's never been polished - which is a very good thing. Your dad must have good taste, as this is a watch with a bit of a cult following and is definitely the version to have.
The crystal is a bit more work to replace on these than on most watches, but it'll look spiffy once that's done & the all the bits of degraded gasket have been taken off.
Mechanically, the most important thing is the one you mentioned - don't run it unitl it is serviced. It'll be dry as bones in there & you don't want to risk any damage in the movement.
Great discovery & gift from your dad
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