Featuring an analog calculator system that would make Pythagoras proud, the Fortis Men's B-47 Calculator Automatic Watch turns intricate mathematics into a truly avant-garde style. The bidirectional, stainless steel bezel, complete with a series of numerals and indices, turns either direction to allow computation from multiplication and division to trigonometry. The silver-toned stainless steel case holds a handy Fahrenheit-to-Celsius table engraved in its back. An antireflective sapphire window protects a dial made up of alternating black-and-white concentric rings containing many series' of smaller numerals. White hands tell analog time with the help of white Arabic numerals at the three, six, and nine o'clock positions. A date display sits disguised at the four o'clock position. The fine, medium brown calfskin band connects with a classic buckle. This shock-absorbing watch uses automatic movement to keep precise time, and the whole beautiful timepiece is water resistant to an exceptional 660 feet (200 meters).