“U.S. No. 1” consists of potatoes which meet the following requirements:
Similar varietal characteristics, except when designated as a mixed or specialty pack;
Firm;
Fairly clean; 2
2 Potatoes in containers bearing official State Seed Certification Tags and Seals are not required to be fairly clean but shall be free from damage by dirt.
Fairly well shaped;
Free from:
Freezing;
Blackheart;
Late blight, southern bacterial wilt and ring rot; and,
Soft rot and wet breakdown.
Free from damage by any other cause. See §§ 51.1564 and 51.1565.
Size. Not less than 17/8 inches in diameter, unless otherwise specified in connection with the grade.
For tolerances see § 51.1546.