The sporty 105 St Sa UTC wristwatch can be used as a versatile instrument thanks to its range of features. It has a second time zone on a 24-hour basis, which can be set using the scratch-resistant matt black bezel that rotates and has an hour ratcheting mechanism. The watch also functions as a compass: the UTC hand in the form of an arrow can be used to roughly determine the points of the compass. The details of the mechanical movement are visible through the anti-reflective sapphire crystal glass case back.