No pat version produced in the 60s. This particular crankset has been modified from “road” to “track” milling the inner part of the spider (picture for reference). So basically it “born” as road, but now it’s for track or single speed transmissions. Internal storage code: 2923. Square taper ISO interface. 151BCD with 48 Track Campy chainring. Used in good condition, working fine. Has been modified (read the description and look at the pics). If you don’t find some details you are interested in, feel free to ask. Allowed in 14 days buyers pay for the return.