This rigid case is the correct spares box for the ultra rare bakelite framed Mk.IVA flying goggle. Approximately 12.5 x 16.5 x 4cm. Appears to be constructed from faux leather covered wood. Hinge opening, part velvet lined with storage space inside for spare windows (lenses), a tube of anti-dimming compound, spanner and anti-glare shield. This example is a little soiled but in excellent overall condition. Empty. Extremely rare. Stock code G23799A.