Joined: Nov 2010
Posts: 6,035
Likes: 118
From: The Garden State
Bikes: 1917 Loomis, 1923 Rudge, 1930 Hercules Renown, 1947 Mclean, 1948 JA Holland, 1955 Hetchins, 1957 Carlton Flyer, 1962 Raleigh Sport, 1978&81 Raleigh Gomp GS', 2010 Raliegh Clubman
Pulley looks replaced, I'm pretty sure they were smooth steel.
If you can't find a pulley, buying a "parts derailleur" maybe be a reasonable option. Looks like the French made Cyclo parts would fit.