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This looks like a poorly played 89, or maybe diamonds that are afraid you will fold, or a ten making a ridic blocking bet, a smaller overpair hoping to seem like a bluff and get looked up, or even a bluff w/56 or the like. I think you have a slim call; I think you win this in the range of 20-25% of the time, which is about breakeven but when in doubt I like to call.

As said before your bet sizing is good to this point.