Originally formed in WWI but gaining fame in the Burma Campaign 1942-45 when it was continually in action, the 17th Indian Division also enjoyed the distinction of being known as the Black Cats. Their original formation sign had been a lightning bolt but changed to this design in mid-1942. The British Indian Army already numbered some 200,000 men at the outbreak of the war. By the end of the war it had grown to 2.5 million, still the largest volunteer army in history.
Unit formation sign patches are a very affordable way of becoming a militaria collector as they start at about £10. Most come in forward facing pairs but contemporary photographs show that soldiers sometimes wore mismatched pairs or a single one on a bush hat. Generally, it is best to focus on a particular theatre or campaign such as Normandy or the Far East. Interest in patches continues to grow and they often crop up on programmes like Antiques Roadshow.