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That's an Original Tamagotchi, either a P1 or a P2, I'm not sure xD
They were the first ones to come out back in 1996 I think, and they're kinda expensive on eBay. xD
I just got a P1 for Christmas, and I really enjoy it! It's really simple but it's also one of my favourites because of its simplicity.
I suggest keeping it because I looove originals, or you could sell it if you're not interested. xP
Lucky you got it for 99 cents! Mine was like $30 for new in box. =.=