The balls manufactured in the extreme months July, August, September and December, January and February were probably undercured (due to cooler weather) or overcured (due to the extreme Texas heat) probably because the balls sat in warehouses with limited climate control. The Ps, Qs, Rs, Ss, Ts, (March through June) and the Xs and Ys (October and November) were probably the best made since the outside temperature was moderate and the balls were able to cure naturally. Many of the balls made that year that really bled were manufactured from March through December. This holds true with all Columbia balls made in San Antonio until the manufacturing facility was shut down last year. ![]() Bleeders made from 1990 on had second digits starting with A. In the mid-late 70s, the letter sequence started with N, so your 7Q was made in March 1977. Know that the first digit in the serial number refers to the last digit of the year the ball was manufactured, the second digit was a letter that refers to the month.
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