"U.S. No. 1” consists of almonds in the shell which are of similar varietal characteristics and free from loose extraneous and foreign material. The shells are clean, fairly bright, fairly uniform color, and free from damage caused by discoloration, adhering hulls, broken shells or other means. The kernels are well dried, free from decay, rancidity, and free from damage caused by insects, mold, gum, skin discoloration, shriveling, brown spot or other means.
CFR 7-51.2075-2013 history
2013CFR 7-51.2075-2013 Agriculture. Part51:Fresh fruits, vegetables and other products 12(inspection, certification, and standards). Section51.2075:U.S. No. 1.