Question #19100. Asked by 
Mercman. 
Last updated Nov 27 2021.
                        
The ball shall be a sphere formed by yarn wound around a small core of cork, rubber or similar material, covered with two stripes of white horsehide or cowhide, tightly stitched together. It shall weigh not less than five nor more than 5 1/4 ounces avoirdupois and measure not less than nine nor more than 9 1/4 inches in circumference.
 https://www.smithsonianmag.com/arts-culture/a-brief-history-of-the-baseball-3685086/
 https://www.smithsonianmag.com/arts-culture/a-brief-history-of-the-baseball-3685086/|  | 
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