Thorn Sunflood MK12 500w halogen fitting

This was given to me for free by the guy who runs the shop I visited recently. It is not NOS and appears to have been used before, albeit briefly judging by its condition. Here it is after a much-needed clean. Now, I don't usually collect fittings like this but the fact this is a Thorn design classic and very well made (before the days of cheap plastic PIR halogen fittings) it's a keeper.