(a) Registration. Series HH bonds may be registered as set forth in subpart B of 31 CFR part 353, also published as Department of the Treasury Circular, Fiscal Service Series No. 3-80.

(b) Validity of issue. A bond is validly issued when it is registered as provided 31 CFR part 353, also published as Department of the Treasury Circular, Fiscal Service Series No. 3-80, and bears an issue date and appropriate validation indicia.

(c) Taxpayer identifying number. The registration of a bond must include the taxpayer identifying number of the owner or first-named co-owner. The taxpayer identifying number of the second-named coowner or beneficiary is not required but its inclusion is desirable.