Section 9(5) in The Punjab Cotton Ginning and Pressing Factories Rules, 1965
(5)The serial number shall consist of two parts. The first part shall consist of two numerals being the last two integers of the calendar year in which the cotton year has commenced and the second part shall be the running number of the bale according to the factory's press register. A new series of running numbers shall be started at the commencement of each cotton season on the first day of September in each calendar year and shall be terminated on the thirty-first day of August of the following year.
