17 C.F.R. § 240.3a12-7
Any put, call, straddle, option, or privilege traded exclusively otherwise than on a national securities exchange and for which quotations are not disseminated through an automated quotation system of a registered securities association, which relates to any securities which are direct obligations of, or obligations guaranteed as to principal or interest by, the United States, or securities issued or guaranteed by a corporation in which the United States has a direct or indirect interest as shall be designated for exemption by the Secretary of the Treasury pursuant to section 3(a)(12) of the Act, shall be exempt from all provisions of the Act which by their terms do not apply to any "exempted security" or "exempted securities," provided that the securities underlying such put, call, straddle, option or privilege represent an obligation equal to or exceeding $250,000 principal amount.
17 C.F.R. §240.3a12-7
15 U.S.C. 78a et seq., and particularly secs. 3(a)(12), 15(a)(2) and 23(a) (15 U.S.C. 78c(a)(12) , 78o(a)(2) and 78w(a)