31 C.F.R. § 363.164 Is a converted savings bond eligible to be converted back into a definitive bond?
Title 31 - Money and Finance: Treasury
Once a definitive savings bond has been converted to a book-entry bond, it may not be converted back into a definitive bond.
Title 31: Money and Finance: Treasury
PART 363—REGULATIONS GOVERNING SECURITIES HELD IN TREASURYDIRECT
Subpart E—Conversion of a Definitive Savings Bond
§ 363.164 Is a converted savings bond eligible to be converted back into a definitive bond?