19 U.S.C. § 199 — Judgments, how payable

In all proceedings brought by the United States in any court for due recovery as well of duties upon imports alone as of penalties for the nonpayment thereof, the judgment shall recite that the same is rendered for duties, and such judgment, interest, and costs shall be payable in the coin by law receivable for duties, and the execution issued on such judgment shall set forth that the recovery is for duties, and shall require the marshal to satisfy the same in the coin by law receivable for duties; and in case of levy upon and sale of the property of the judgment debtor, the marshal shall refuse payment from any purchaser at such sale in any other money than that specified in the execution.