Another thought(s) ... it might have been a case from an industrial "Tool Room" - a location where millrights would store,maintain/true/sharpen specialty tools , chucks , jigs , heads , microcrometers & etc. & a place where a machinist would have to 'sign off' on being assigned a do-dad , before the item left the 'room/cage' - all I can say is that it looks c1900's-ish , without having it b4 my eyes .