Crimped means the tube has been pressed inwards forcefully, there would be long indentations on the tube which are obvious. If the tubes are round, they are not crimped.
Width of rear axel is important.
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1972 Colnago Super, 1972 Bianchi Specialissima Professionale, 1998 Colnago Monotitan, 2014 Salsa Horsethief, 2015 Salsa Mukluk Ti