Do you have a pair of them, or just the one cabinet?
One is problematic, having a pair adds value ...
Looks like a JBL 4320 I had long ago ... (old 2-way studio monitor)
Probably a 15 inch woofer and LE85 Horn/compression Driver with a lens -
but your woofer looks "funny" - no ribs and has some kind of shininess - has it been treated with anything?
here is a glance at my old pair as I was upgrading them to 3 ways ...
the lens was off the center horn while I worked -
and you can see the 2405 Slot-tweeter In installed to the left of the horn.
Later on, I moved my parts into a pair of L200 cabinets as I thought they just looked better in my home
There is also this C50SM image I found in the library section of the Lansing site -
Notice its just the enclosure, with the same overhangs on top and bottom lip -
but different speaker and crossover loads were available.
Mine and your cabinets had the walnut finish,
but there was also an industrial grey/silver cloth grill design listed here ...