Hi John, looks original, but I would hold out for one with no enamel damage as these are not too hard to find.
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I agree with Adrian, you can find mint cased examples of these all over the place. These are as common as they get and not all that popular. Quality should always come first along possible re-sale potential and stuff like this you will be stuck with. You should buy the nicest one you can afford (without going crazy) and be done with it.
As the guys have said, it's original but the damage really kills this piece. I would leave it well alone personally. Leon.
"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." Ernest Hemingway