There is no serial number on the seat tube, only a 6 digit number on the left rear drop out.Is the serial number on the seat tube. Yellow head tube is quite rare. Here's the 1974 catalogue. Yours has the space age script so is probably a bit earlier. @vcballbat View attachment 1013938
Does it have a W or N prefix?There is no serial number on the seat tube, only a 6 digit number on the left rear drop out.
Nor is the rear mech or gear levers. Shame about the rear wheel, I think you'll struggle to find the correct hub at least.Here is a pic of the “complete” bike. I dion’t think the rear wheel is standard. It does have the 3 bolt crank.