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I'd have never bet the 501 is a registered trademark and is more than a century old product! https://www.levistrauss.com/wp-content/uploads/2014/01/History-of-Levis-501-Jeans.pdf
c1890: 501® is used to designate the famous copper-riveted waist overalls. We don’t know why this number was chosen.
c1927: Cone Mills develops the 10 oz. red selvage denim exclusively for the 501® jeans. The denim is woven in 29” wide looms.
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