31 CFR § 363.161
What definitive savings bonds are eligible to be converted to book-entry bonds?
July 31, 2023
§ 363.161 What definitive savings bonds are eligible to be converted to book-entry bonds?
Series E, Series EE, and Series I savings bonds issued in denominations of $25 or greater are eligible for conversion to book-entry bonds in TreasuryDirect ®.
[74 FR 19420, Apr. 29, 2009]