Lovely antique "Crown" flat hand lamp by the Dalzell, Gilmore and Leighton Company, late 1800's, Findlay, Ohio

Described in Thuro, book 1, page 252-e 

Very nice used and useable antique condition; no chips or cracks - rubbing to underside of base from age and use

Approximate measurements (may vary slightly): 3 3/4" high to top of brass collar, 4" diameter base, 7/8" collar threading for no. 1 burner