Note the patent numbers in the last pic.
Was on a MG TC Special OEM radiator (53mm diameter) that was in a fire.
Seems in good condition still with a grub screw to lock it against the rad thread.
The hinge has some slop but I imagine that is normal for these as the new rubber gasket would tighten the lid when closed, and the lever action appears fine.
Haven't seen another genuine one for sale.
I post overseas but if your country charges a tariff I will need to be payed that before l post, as ebay does not collect it - the post office charges me. Overseas buyers please send me your postcode/state etc and I will check at the post office for an accurate cost before you pay. Ebays calculator is often wrong.
Cheers