19 CFR 159.31 : Customs Duties (§ 0.1 To Parts 400-599) — (§ 141.0 To Parts 193-199) — U.S. Customs And Border Protection, Department Of Homeland Security; Department Of The Treasury (Continued) (§ 141.0 To Parts 193-199) — Liquidation Of Duties (§ 159.0 To § 159.64) — Conversion Of Foreign Currency (§ 159.31 To § 159.38) — Rates to be used.

4 Aug 2016

Except as otherwise specified in this subpart, no rate or rates of exchange shall be used to convert foreign currency for Customs purposes other than a proclaimed rate or certified rate or rates.

19 CFR 159.31