Olympus Accessory Shoe 1 with original box!
The Olympus Accessory Shoe 1 is a removable hot shoe adapter designed for the vintage Olympus OM-1 and OM-2 film cameras. Because these early SLRs did not have built-in hot shoes on their pentaprisms, the Shoe 1 screws into the top of the camera to provide an electrical connection for mounting a flash.