The Aquaracer from TAG Heuer features all six of TAG Heuer's features of a professional sports watch, including sapphire crystal, luminescent markers, screw-in crown, unidirectional rotating bezel, a double safety clasp and 300M water resistance. This model features 18K. Gold and steel. Warranty Information. Case size: 39mm. 18K gold and stainless steel. Made in Switzerland. Sapphire crystal. Luminescent markers. Swiss quartz movement. Screw-in crown. Unidirectional rotating bezel. Double safety clasp. Water resistant to 300M. Photo may have been enlarged and/or enhanced.