The Siebenberg House, an Archaeological Site in The Old City of Jerusalem.
This key ring is an exact replica in Sterling Silver or gold plate of the key found at the Siebenberg House excavations in the Upper City of Jerusalem. The key evidently belonged to the Lady of the house that was uncovered, and was used by her to open her jewelry box.
The Sabbath Tractate of the Talmud addresses whether a lady is permitted to wear this type of key on the Sabbath, since a key was considered a tool, and therefore could not be carried on that day. The sages decided that if the key were fashioned out of gold or silver it would be considered jewelry, which could be worn on the Sabbath.