Timer bomb chronograph, produced by Universal Genève around 1940, distributed to the Italian Royal Air Force, by A. Cairelli-Roma, complete with its original leather strap. It was used by the personnel assigned to the Pointer-Bomb Dropper system on board the bombing planes of the Italian Royal Air Force during the Second World War.
The timer bomb was placed in a special housing on the finish line called "Iozza", an instrument that was part of a targeting system through which the times for dropping the bombs were calculated. However, for the personnel in charge of this maneuver, it was customary (probably for more practical use) to wear it over the flight suit, thanks to its large and sturdy leather strap supplied.
The dial is divided into 60 seconds; internally there is a scale of flight altitudes, divided into hectometers (hm) and each altitude is marked corresponding to the duration of the falling trajectory of the bombs. There is also a triangular index that can be moved in both directions by means of a rotating bezel, which could be stopped in any position on the dial.
The chronograph complete with its original strap is in like new condition, with all its mechanisms in perfect working order.