I've been working on rebuilding my 1969 Raleigh International after sending it to L'Atelier for some minor Gugificazione (water bottle bosses and front rack mounts). The coil spring on the rear derailleur broke about a year ago, and it took me a long time to get around to replacing it. The chrome is rough and the paint, while, original isn't as good as it looks in a picture, so I decided to get the basic braze-ons and gamble that I could match the paint.
Before paint:
After (Gloss Black Rustoleum):
I may never buy another non-black bike again.
I ended up replacing the 3-Pulley LePree rear derailleur with a 3-Pulley XC. I think this is about 38T of wrap.