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@gbj_tester
ftfy
Italians frame builders used Columbus, French makers used Vitus. Reynolds had just the one alloy back in the olden days, although they did offer it in plain guage as well as butted, and latterly in several variants aimed at specific markets such as 531Pro and 531ST. After almost half a century of little change, they had a rush of blood to the head in the 80s with the launch of 753, basically the same manganese molybdenum alloy as 531 but with additional heat treatment, and 501, a chrome molybdenum alloy much like the ever popular 4130, followed by 853 and the ensuing plethora of variants to provide a wide range of qualities to diffuse the brand into different market segments.