The Cinelli model 64, also known as the Giro D'Italia is the shallowest drop of the three Cinelli road bars. At the tubing end, it has a 24.2mm outer diameter and a 1.7mm wall thickness. Like many bars, the wall thickness will vary, between the ends, because of bends and bulges. A sleeve is used to build the bar center diameter out to the Cinelli 26.4mm. The sleeve covers the center most 119mm of the bar and at its center has a 40mm length of knurls for the to stem to grip. The straight area of the top section is 250mm long. Some bars have a groove is pressed into the front face of the top section of the bar, and extends through the forward bend. This groove is to recess the brake and shift cable if an aerodynamic brake/shift lever is used. The drop measures 138mm center to center. The lower flat section of the drop measures about 4.25" (110mm). The Giro D'Italia is Clear anodized leaving it a Silver color and available in four widths, 38- cm, 40 cm, 42 cm, or 44 cm. The 42 cm model weighs 311.5 grams. Made in Italy. (above from previous similar entry)

This particular bar came off of a 1980 bicycle and only had the Giro D'Italia stamp below the "Cinelli" stamp, no wreath or star as seen in other variations.  The other interesting thing is this measures 26.2 at the clamp. Not sure exactly how this is translated if it is hat it is or rounded up or down to 26.4 or 26.0 respectfully.