Sinn Pilot Chronograph 103 Ti UTC TESTAF 103.0791

TESTAF stands for Technischer Standard Fliegeruhren, a technical standard for pilot's watches created by the Faculty of Aerospace Technology at FH Aachen, which certifies the watches independently. Sinn showed its TESTAF models at Baselworld 2013. Inside is the self-winding Valjoux 7750, in a titanium case with an argon dehumidifying module.

Take away the UTC hand and it is the 103 Ti TESTAF (103.079): the same 15.5 mm thick case on a 20 mm strap, the black dial with Arabic numerals and the rotating 60–0 countdown bezel. The 103 Ti IFR (103.0793) and 103 Ti UTC IFR (103.0794) are certified to DIN 8330 rather than TESTAF and wear thicker, at 17 mm. The 103 St (103.031) is the same watch in stainless steel.