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Hard to say. If nothing else though it will revitalize the horn and give a clearer indication of what should be sanded away. Check out this one, for example:
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I've always wondered whether the frame on this little Engstrom has been plated. I honestly don't know enough about gold, gold plating, etc. to tell for sure whether the 'gold' really is gold.
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+1 to Martin's advice - don't overdo anything! Are those horn scales? If so I'd give it a soak in neatsfoot oil. Other than that though, I don't think it looks like it needs anything else done to it...