Sinn 103.B.SA.AUTO Pilot Chronograph Watch with Superior Visibility and Precision TimingSinn 103. B. SA. AUTO Description This is a pilot chronograph featuring excellent visibility and timing accuracy, along with a simple dial. It inherits the style of Sinn's (Sinn) historical pilot watches that have been in use since the 1960s when adopted by the German Air Force, representing the fundamental spirit of watchmaking cultivated through the production of cockpit clocks. It boasts specifications as a measuring instrument and is among the top