What you have there is a very cool, and rather nice SM300, its actually not that beat-up at all, the case is in great shape, the caseback doesn't look terrible, and the bezel is relatively good. This watch needs a new crystal, and a full service from a vintage specialist watchmaker, but the upshot is, the crystal is the worst part of this watch, and is also the cheapest thing to fix, its about $30-50 for a new one.
The other nice thing is the movement in these is cheap to service and has excellent and cheap parts availability. If you like we can point you in the direction of a couple of good independent vintage specialist watchmakers that can take good care of you for a reasonable price.
Well worth keeping in the family too long term, they're a great watch.
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