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.