One of the most complicated and rare chrono: TAG HEUER GRAND CARRERA 1/10th second chronometer CAV5186 yellow edition . 43mm titanium case with black titanium carbide TiC3 extremely hard (Mohs 9–9.5) coating treated idrorepellete, high beat Calibre 36 (El Primero from ZENITH), C.O.S.C. certified 1/10th second precision mechanical chronometer( a sign of very high precision and quality ). Full set box and papers and bought in Adelaide in 2012. Though 1/10 not very practical but definitely a true signature of a great chrono. Watch in good condition
https://www.calibre11.com/tag-heuer-grand-carrera-calibre-36-rs/