Cap Badges of the 42 Royal Highland Regiment (Black Watch)

      This cap badge the Black Watch of uncertain age is based on three of the campaigns the 42nd Royal Highland Regiment fought in during the Napoleonic Wars (1792-1815):--
           Depiction of St Andrew standing on the back of the Egyptian sphinx
           Egyptian Campaign 1802
           Peninsular Campaign 1804-1814
           Waterloo Campaign 1815

Compare this with the 42nd regiment's badge from the modern period shown below.