When wine of Puerto Rican manufacture is to be withdrawn for shipment to the United States, or for use in an article made with wine only or with wine and beer only, for shipment to the United States, application for permit to compute the tax on, and to withdraw, the wine shall be made on TTB Form 5100.21, in quintuplicate, by the proprietor of the bonded premises where the wine is stored. If the withdrawal is to be made in casks, barrels, kegs or similar containers, the proprietor shall enter the name of the winemaker producing the wine, the serial numbers of the packages, the total number of wine gallons contained therein, and the taxable grade of the wine, for example, “not more than 14 percent” if the wine contains not more than 14 percent of alcohol by volume, “14-21 percent” if the wine contains more than 14 percent and not exceeding 21 percent of alcohol by volume, “21-24 percent” if the wine contains more than 21 percent but not exceeding 24 percent of alcohol by volume. If the application covers more than one taxable grade of wine, the quantity in each taxable grade shall be reported separately. If the withdrawal is to consist of bottled wine, the proprietor shall show the number of cases, size of the bottles, the number of bottles per case, the total quantity in wine gallons, and the taxable grade of the wine in the manner stated above. The proprietor shall forward all copies of the form to the Secretary. If the application is properly prepared and is otherwise in order, the Secretary or his delegate shall execute the permit, retain one copy, and return the original and three copies to the proprietor.