For your consideration I offer a late 19th century illuminator and burner for a no. 2 collar size oil lamp. The illuminator is the bottom part of a two part shade. I do not have the top shade. The illuminator burner has a thread size of 1 13/16 inches which would also be the size opening of the threads on a lamp. This is a standard no. 2 size. The fitter of the bottom of the shade is 3 inches. The top opening in 7 inches. The shade would accept either a slant our rounded shade but it has to be the type that has a shoulder that rests on the rim and the 7 inch portion fits inside the shade. I am listing a painted Sandwich glass shade which is one of the types used so you can get an idea. The burner is a nickle plated brass White Flame and is marked White Flame Light Co. Grand Rapids Mich. The inside of the burner where the wick housing is is not brass, neither is the wick rod and wheel. The burner is dirty and I see no name on the wick wheel. The inside wick housing is very dirty. I have not attempted to clean it. There is an old wick in the burner but I would not advise using it as it is pretty dried out. I will carefully wrap for safe transit. Check my shop for other items of interest.