TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 0300-43 P5M Marlin The first flight of the

The first flight of the AC-130A wasn't until 1966

and original wooden case

Here is Radar Pressure Indicator use in radar-equipped aircraft during late WWII and post WWII

In between when the landing gear is unlocked

in its original carrying case

TBF-1 Avenger Torpedo Bomber Cruising Calculator Mark 1-A, Ser # 0300-43 P5M Marlin The first flight of theThis is an authentic original WWII era Cruising Computer Mark 1 A designed specifically for the US Navy's Grumman Torpedo Bomber TBF 1. The purpose of the calculator was to determine the range, in nautical miles, of the aircraft under various conditions of aircraft weight, head tail winds, fuel quantity on board, true air speed, altitude, and throttle and supercharger blower settings. The calculator is essentially a custom 3 panel slide rule