A Rare Big Roman Key Ring 1-3 AD . Very nice piece & Heavy It is also said that the key was invented by Theodorus of Samos in the 6th century BC. The Romans invented metal locks and keys and the system of security provided by wards. Affluent Romans often kept their valuables in secure locked boxes within their households, and wore the keys as rings on their fingers. Weight : 15.51 Gram Inside Diameter : 20.1 mm Lengt : 33.5 mm Material : Bronze Source : T.N. Pollio See images for own impression Own private collection inherited from Grandfather, who built the collection in the 1960's No shippin to the USA