Here is a unique sconce lamp from the 1900s.  or even earlier in late 1800's

it is made of cast aluminum but looks like CAST Iron,  just much lighter in weight.
 and looks like a rough hammered metal exterior.

with a pointed top and round amber art glass inside....
and mounted flush to the wall,  outdoors or indoors 

needs the wiring added,

2 holes to hand on bolts...'has a place to hang it up on a large hook. 

it is about 14.5 
by about 5.5  inches wide.