This is an original Standby Attitude Horizon indicator gauge instrument as used in the USN USMC A-4 Skyhawk. This gauge was used by the pilot when his main attitude indicator failed. This gauge is 2 1/2 x 2 1/2 x 9 inches. This gauge may have been used in other aircraft such as the F-4, F-105. Thank you for your interest in my auctions. The item “RARE! USN USMC A-4 Skyhawk Stanby Attitude Indicator Gauge Instrument” is in sale since Saturday, January 24, 2015. This item is in the category “Collectibles\Militaria\Vietnam (1961-75)\Original Period Items\Other Vietnam War Orig. Items”. The seller is “dauntlessaviation” and is located in Apache Junction, Arizona. This item can be shipped worldwide.