This is a Sopwith Snipe control grip and pretty much in line with British grips throughout the 2 wars with two slight differences. Contrary to later Spitfire and Hurricane grips the guns could be fired individually and the firing button with an integrated safety catch came later and most probably for very good reason. The levers would engage an interuptor gear which would in turn fire the guns avoiding hitting ones own propeller. The little hole at the top of the grip is a blip switch (really more a button). This is a common feature in rotary engines to temporarily stop it from creating power by switching off the magneto. This is the cause of the typical engine revv’ing sounds when a rotary-engined aircraft is taxying or coming in for a landing.