I quite like the lens from an aesthetic point of view, may be crap for mine lighting purposes but it'll look good on the lamp when its not being used.
One thing I did overlook on first check was the metal tape painted black which you can just make out in pic 1 above. Underneath the tape was four 0.5cm corrosion holes. Someone had had the bright idea to tape it up and colour it in with permanent marker :crazy
Still, explains why I got it so cheap with my best offer. Five minutes later with the rest of my plumbers weld used up it's sealed and safe.