Stores ref. 15A/150. Standard wartime quick release box with the fully rounded front plate marked 'Turn to Unlock - Press To Release'. The position of the front plate in relation to the attachment point suggests this has been removed from an Observer-type harness but this can be changed to suit a Seat-type harness quite easily. Two of the backplate screws are missing and the box shows use and wear but is in good condition overall. Stock code M16743.