A gorgeous yellow Centurion Semi Pro recently followed me home. The seller didn't know much about it; it belonged to her recently deceased wife, and the seller thought her wife was the original owner. Here it is in as found condition.
Sorry about the picture quality. I was too eager to start dismantling and cleaning to wait for daylight.
The serial number is "M7L44193" which as I understand suggests that the frame was made by Miki in the summer of 1977.
Everything else about the bike (paint color, graphics, components) suggests it was sold in 1979. Other than the tires and saddle which appear to have been replaced at some point, the only other component that doesn't match the 1979 catalog is the crankset. Catalog says Sugino Super Mighty Victory 42/52 with drilled chainrings, but mine has a SR Royal 42/52 with undrilled chainrings. Based on how original everything else is, I'm betting the SR crankset is original.
The top tube measures 57cm CTC and the seat tube is 58cm CTC.
I can't tell you what a joy it has been to take this bike apart. I felt like I was working on an archeological excavation, unearthing a priceless artifact that's been buried in a pile of grease, dust, and cat hair in a basement for the past 40+ years. Everything is in perfect condition, unmolested by ham-fisted amateur mechanics like myself. It needs new consumables, a proper saddle and lots of cleaning and repacking of bearings, but otherwise it's all there.
I'll share more and better pictures in a more appropriate thread once I finish cleaning and re-assembling everything.