``U.S. No. 1'' shall consist of apricots of one variety which are mature but not soft, overripe, or shriveled and which are well formed, free from decay, cuts, skin breaks, and worm holes and free from damage caused by limbrubs, russeting, growth cracks, dirt, scab, scale, hail, bruises, disease, insects, or mechanical or other means. For tolerances see Sec. 51.2928.