4.5cm (1.75in) x 11cm (5.2in) x 8.5cm (3.2in)
Silver. Rectangular box with engine turning to the hinged lid, the front engraved with the Mars and Minerva insignia, symbolizing the conjunction of the War and Wisdom, over the date ‘18.12. 37’ betwixt the engraved initials ‘CGC’ and ‘B.Coy’. Maker’s mark of AE Poston & Co Ltd. Hallmarked 1936.