CFR / 
Title 7
 / 
Part 51
 / 
Sec. 51.1401 U.S. No. 2.
The requirements for this grade are the same as for U.S. No. 1 except for:
(a) No requirement for uniformity of color of shells; and,
(b) Increased tolerances for defects see Sec. 51.1404.
Size Classification