Originally Posted by Picchio Special

Other Raleigh 753 frames would not have had vertical dropouts. At Ilkeston, those were reserved for the TT frames (they're also drilled out). Ilkeston TT frames also had stickers instead of headbadges. Obviously, the front derailleur allows for the use of a front double chainring for hillier courses. That frame may also use a lighter gauge of 753 - not sure about that. It also lacks cable guide braze-ons on the top tube, and the bottom bracket is slotted. There are no brazed-on bottle bosses - that's pretty telling for the time. The geometry is also likely different. The differences in dedicated time trial frames are definitely much more subtle in that period than they would become later, but they're there.