http://www.amazon.com/gp/product/B00E3T237C
That stuff will remove scratches from acrylic crystals. It's pretty amazing. If it's not cracked or very deeply scratched, you should be able to polish it up.
As for the value, if you had an original strap, box, papers, it would be worth a lot more, but as it sits, it's probably worth $200 at most? I could be wrong.
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