Recent CL pickup.
I'm pretty sure this is from the late 70s. I threw a different set of wheels on it to use a their newer freewheel and tires, and I also threw a new chain on it (although I have the original set with Univega 100psi tires). It rides awesome. A little on the heavy side, but still a sweet ride. Not light and nimble, but apparently sturdy and ready for touring.
The Brooks Saddle is from a LBS. I don't think I have it set up right, because I did approximately 25 miles on Saturday and it hurt to use the plumbing for the next day or so. I think I have to tilt it forward a bit? I thought it was set up parallel to the ground, but on closer inspection it might need to tilt one more notch forward. I also might need to raise the stem.
The serial number is K984450. T-Mar?
AR Front Derailer
ARX Rear Derailer
Suntour clamp-on downtube shifters and cablestops
SR Custom 170mm cranks
SR Road Champoin Handlebars
Drilled Dia-Compe levers
Dia-Compe Side-Pull brakes
Araya 27x1-1/4 rims (before I swapped them out)
Univega 100psi tires (before I swapped them out)
Selle Italia Touring Saddle (before I swapped it out)