At most, $100 plus the interest that accrued on it to maturity. For that calculation you'll need to know the rate and terms of the CD, and if that interest was ever paid and if the CD was ever cashed.
If the bank exists that issued it, the account would have been considered abandoned. That may be the case if the bank doesn't exist. In that case, state laws require funds be sent to them after a period specified by state law.
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