The WW1 US Army Air Service Corps Altimeter Altitude Gauge Instrument by TYCO is a historical aviation part that accurately measures altitude in the skies. This specific model is a Type C altimeter, used during World War I by the US Army Air Service Corps to determine aircraft altitude and ensure safe navigation during flights. With the TYCO brand known for quality and reliability, this altimeter would have been a crucial tool for pilots to accurately gauge their altitude while in the cockpit.