Giant hunk of glass by who knows (I think Komine) sold by Soligor for Olympus SLRs.  Weighs 540g with caps, you will know this is mounted on your camera.  

The lens looks very clean, no major scratches etc., but there is a giant fungus in the rear lens block.  Could be cleaned quite easily but some etching will likely still be visible on the coating.  Nice project for someone who wants to learn lens repair.