Derbyshire Yeomanry cap badge, bimetal, King's crown

The Derbyshire Yeomanry was a yeomanry regiment of the British Army, first raised in 1794, which served as a cavalry regiment and dismounted infantry regiment in the First World War and provided two reconnaissance regiments in the Second World War, before being amalgamated with the Leicestershire Yeomanry to form the Leicestershire and Derbyshire (Prince Albert's Own) Yeomanry in 1957.