Cash, postal money orders, certified or cashiers' or treasurers' checks, and bonds or notes of the United States, or other obligations which are unconditionally guaranteed as to both interest and principal by the United States, may be pledged and deposited by claimants as collateral security in lieu of corporate surety bonds in accordance with the provisions of Treasury Department Circular No. 154, revised (31 CFR part 225).

(Sec. 15, 61 Stat. 650, sec. 7101, 68A Stat. 847, as amended; (6 U.S.C. 15, 26 U.S.C. 7101))