Some "crimped" or embossed tubes were done by the tubing maker, but many were done at the frame builder level, and often with little history (especially in Italy). There was a crossing pattern that some call 'wheat sheaf' done to the main tubes on marques such as Ciocc that nobody could track down, but Deda tubing with such treatment was confirmed NOT to have ever been made as such by the Deda factory. Nobody (except for Gilco and Colnago) claim that the crimping/shaping/fluting actually makes a positive contribution to strength or other performance, but perhaps it might in some cases and perhaps it's only cosmetic in most cases. YMMV.