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An antique EF Jones oil lamp burner with shade ring and a glass chimney.
Patent date of 1859.
The inner diameter of the shade ring is right at 3 1/2” - maybe slightly smaller.
3/4” across the threads. 2” tall
The shade ring sets on the burner but doesn’t seem to have a way to “lock in”. But it sets just fine.
Overall, good used condition.
Seems to work as it should.