Antique brass no. 2 oil lamp burner, spring clip, for a lipped chimney. Burner had a 1 3/16" threaded base and takes about a 2 1/2" chimney. Thumb wheel has three patent dates, last one being Dec. 10, 1867. Condition is good, good spring clip, good wick raiser, no dents or stress cracks, needs cleaned and polished. Nice early oil lamp burner.