Gurkha Rifles Officer's Pouch Badge White Metal Bugle

Not sure if this is 1st or 4th Battalion Gurkha Rifles, or something else entirely. Came in with a large Gurkha collection. A large badge, cast in white metal with three original copper loops to reverse. Circa 53mm tall and 57mm wide. A substantial badge, no doubt theatre made, any information welcome.Comm EdBr