Chronograph wristwatch in 750 gold and steel consisting of a case and bracelet made by Gay Frères prototype for Breguet, Type 20 Aeronavale, ref. 3800 according to information provided by the seller Movement: automatic Case: diam. 39 mm, unidirectional rotating bezel Complications: 2-counter chronograph with central seconds, subsidiary seconds counter Breguet signature: dial, case Gay Frères signature: case, bracelet Signature Lemania: movement According to the seller: This is a prototype. The specificity of this piece lies in the creation of a very secure bracelet that was not subsequently marketed. As this is a prototype, the in-flight complications and the reset of the hour and minute counters have not been installed and the movement is therefore not operational.