The Kukri is a very old weapon though the earliest we know as material culture of today is from the mid 16th- early 17th century. Its origins is debated to be from the ancient world and may or may not have a relation to similar blades used in ancient Egypt, Greece and Roman Empire.
It was widely used by the Gorkhalis in the 18th century and came to be known to the British in the late 18th century, while the first Kukri depicted and published in a book was in 1811 by Col. Kirkpatrick. Following the Anglo-Nepal War 1814-1816, and the start of recruitment of Gorkhalis into the Colonial British Indian Army the Kukri went along and have since then been used by Gurkhas/Gorkhas around the World.
It would be safe (99%) to say that since 1815 the Kukri has been used in all major conflicts & battles the British have fought, where Gurkhas have been deployed. Some of these being in the
20th century:
Afghanistan (current), Iraq (current), Balkans (1990s), Falklands (1982), Malaya (1950-70s), Borneo (1960s) , World War 2 (1939-1945), 3rd Afghan war (1919), Waziristhan (1919-1920), World War 1 81914-1918), China & Tibet
19th Century:
Burma(1824-1880`s), Afghanistan (1839-1880s) , North East Frontier Area (1824-1915), North West Frontiers of India (1839-1880s), Russo-Turkish War (Cyprus & Malta 1878), 1 & 2 Sikh Wars (1840s), 3rd Marahta War (1817-1818), the Indian Mutiny (1857-1858).
This specimen was sold to me as ex British military issue, and has some small rust spots (next to guard). Sheath is complete but Karda & Chakmak missing.