Looks similar to a McGraw Edison Unistyle 400.

Looks like a pile of dirt on top. Is it a bird nest?

Hey that DOES look like a Unistyle 400.

Might be a rebranded Unistyle 400?

It does look very similar to a Unistyle 400 but the latch and slipfitter area of the top housing are different.

For rlshieldjr user, which is above the Housting is an abandoned bird's nest of a Furnarius

http://es.wikipedia.org/wiki/Furnarius

  With respect to the luminaire, would be a changing shape of McGraw Edison Unistyle 400 refractor that artifact was used far the McGraw Edison Unistyle 400 here is called Genalex Buenos aires 2000'll upload more pictures soon.