This is annoying.
I bought a Centurion bike at the local Salvation Army, parted it out and kept the rims. It had a nice pair of 27" Wolber Super Champion Gentleman 81 rims on it. The brake surfaces seemed OK. The only real reason I bought the bike is because of those rims.
Today, I cleaned them up and found this:
They were dirty, I could not see this in the store.
I even had the right length spokes to build a nice set of wheels.
Now I have one good rim in this style, and another that does not match, a Wolber Modele 58.
Anyone got one or the other, 36 hole?