ANTIQUE 1890's B & H NO. 5 RADINAT SALOON/STORE HANGING OIL LAMP LIGHT 
CONVERTED TO ELECTRIC
Converted to electric.  Looks like it could be reversed but you wouldn't be able to fill more than halfway with oil.   It does work, switch is on the bottom.  No top shape and no chimney.  Some age consistent patina. 
Roughly 35 1/4" tall.  Frame is about 16 1/8" at it's widest point.  
Bottom cover is only held on with one thumb screw.  Don't believe it is original to the lamp.