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IMO, you cannot hurt it to use it. It was meant to be used. Your Dad saved it because it was something you gave him.
Not especially valuable, I think. As was said, sentimental. Run it on the...

Oh yeah! Man, you can slip a nice blade in, get a good shave, get your nails and such tuned-up. Some Sheffield nail clippers are easy to find.
Even pop the tops off some cold ones....