Great thread, everyone -- thanks for the contributions. This takes me back to my high school years -- the father of one of my friends had chrome-dipped his ca. 1961 Schwinn Continental at the manufacturing plant where he worked and topped off the Simplex downtube shifter and front suicide lever with matching black-and-white plastic handles designed as aftermarket bling for automotive automatic gear selector and turn signal levers. The bike was heavy, but it looked sharp.

I particularly like the look of red cable housings and graphics on a chrome frame.

The Peugeot PR-10, including its PKN-10 Competition successor, was essentially a PX-10 main triangle, but with seamed carbon steel forks, head tube, and stays, to save money (and increase weight a bit). Both the PR-10 and the PX-10 started the 1970s decade with relaxed geometries, but the tighter PX-10E and PR-10E were introduced ca. 1972, and you evidently have one of these. Peugeot sometimes did some strange things with frame geometry in the largest and smallest frame sizes, and finally got it all sorted out by 1980, when the PKN-10 and PR-10 were offered in "7 anatomical sizes."