As Heuer transitioned the Autavias from screw-back cases to the compressor cases, the Autavia GMT chronographs went through the same transition. Around 1969, Heuer moved the Autavia GMT chronograph to the reference 2446C compressor case.
The first execution 2446C GMT featured a black dial with three white subdials and was signed 'T Swiss' in the bottom hours register. The dial had tritium lume applied hour markers for better legibility over the standard silver markers, as the watch was originally intended for use by airline pilots. The Autavia GMT uses the same plain steel matchstick tritium-filled hands as the standard Autavia, with a red GMT hand and white chronograph second hand. Based on the printing style of the numbers in the registers, this example is from the "Second Execution."
Featuring a very well preserved dial and case as well as the original Heuer sticker on the case back, it is clear that the previous original owner has only worn this watch at most a handful of times and has kept the watch in excellent condition, complete with its original product literature and presentation box.