10.8cm (4.25in) x 8.5cm (3.4in)
Silver and enamels. Rectangular case, the hinged lid enamelled with the International Code of Signals comprising alphabet squares and substitue and numeral pennants, the reverse with engine turned decoration. Gilt interior with inscription 1933. Maker’s mark of Herbert Simpson Benzie of Cowes, IOW. Hallmarked London 1933