N.Y. Comp. Codes R. & Regs. tit. 1, § 165.3 – Size.

(a) The minimum size, or minimum and maximum sizes may be specified in connection with the grade in terms of diameter or weight of the individual potato, or in accordance with one of the size designations in subdivision (c), Table I, or subdivision (d), Table II: provided, that sizes so specified shall not be in confiict with the basic size requirements for the grade.
(b) When size is specified in terms of the customary sizes of potatoes packed to count in standard 50-pound cartons, the weight ranges shown in Table II shall apply. These size designations may be applied to potatoes packed in any size container: provided, that the weight ranges are within the limits specified.
(c) Table I.
Size designation Minimum diameter¹ or weight Maximum diameter¹ or weight
Inches Ounces Inches Ounces
Size A ² 1⅞ ³ ³ ³
Size B 1½ ³ 2¼ ³
Small 1¾ ³ 2½ 6
Medium 2¼ 5 3¼ 10
Large 3 10 4¼ 16
1
Diameter means the greatest dimension at right angles to the longitudinal axis, without regard to the position of the stem end.
2
In addition to the minimum size specified, a lot of potatoes designated as size A shall contain at least 40 percent of potatoes which are 2½ inches in diameter or larger or six ounces in weight or larger.
3
No requirement.
(d) Table II.
Size designation Minimum weight Maximum weight
Ounces Ounces
Under 59 15 —
50 12 19
60 10 16
70 9 15
80 8 13
90 7 12
100 6 10
110 5 9
120 4 8
130 4 8
140 4 8
Over 140 4 8