huge Tiffany sterling silver skeleton key connector

this enormous, solid skeleton key is signed Tiffany and Co. Sterling 925, it weighs 37.34 g and is 3 1/4 inches long. It is heavy and solid. I’ve never seen this style before - it is vintage and had been retired. It looks great as a connector on a chain or as a charm holder. The top opens and is held in place with a very strong Spring mechanism