No information about the Tank Must watch, small model, SolarBeat™ photovoltaic movement. Steel case, beaded crown set with a synthetic cabochon-shaped spinel, silvered dial, blued-steel sword-shaped hands, black strap (calfskin), steel ardillon buckle. Case dimensions: 29.5 x 22 mm, thickness: 6.6 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).