BAUSCH & LOMB 4\" F1.1 E.F PROJECTOR LENS EXTREMELY RARE For Sale

SHOWN IS A VINTAGE BAUSCH AND LOMB LENS EXTREMELY RARE,I COULD NOT FIND ANOTHER LIKE IT WHICH LEAVES ME WITH LIMITED INFORMATION. I BELIEVE IT MAY BE A PROJECTION LEN ALTHOUGH IT MAY BE FOR ANOTHER APPLICATION.VERY FAST LENS AT F1.1.FRONT LENS IS BEVELED AND 4\" WIDE.REAR LENS IS 2\" THE MOUNT PART IS 2.75\" LENGTH IS 4 3/8\".
OVERALL IT IS IN VERY GOOD CONDITION THE FRONT LENS HAS A SMALL PIN HEAD SIZE VERY SHALLOW CHIP SHOWN IN IMAGES.WHEN LOOKIN THRU LENS IN SUNLIGHT THERE IS A RAINBOW EFFECT NOT SURE IF THIS WOULD BE NORMAL FOR A LENS OF THIS SIZE /PLEASE VIEW IMAGES CLOSELY FOR FITMENT AND CONDITION.THIS IS A GREAT EXPERIMENTAL LENS DEFINETLY A CONVERSATION PIECE AMONGST ENTHUSIAST