AT 620 GSD The Renaissance Diamond Tourbillon, which combines sophisticated details with which the brand pampers her admirers. Beautifully balanced affects the dial on which the tourbillon mechanism facing the regulator (hour and minute). The sober elegance of the overall appearance is enhanced by a hand crafted to lizards band. Model: Renaissance Diamond Tourbillon AT 620 GWD Housing: Movement: mechanical, manual winding, flyer Santander 1-minute tourbillon * Regulator * Stainless steel case 316 L, 2 pieces, 10 micron gold plated, brushed and polished Case Diameter 42mm Case Height 12 mm Front Glass sapphire glass Glass sapphire crystal Dial Enamel based, black, 11 diamonds à 1.1 mm SI1, Guilloche by oil pressure method open alarm gold polished hands 3 ATM water resistant (splashproof) brown supple lizard bracelet, sewn with thick thread, 2 loops, 7 levels adjustable Strap width 20 mm Strip length 73 mm to 117 mm Complete solid stainless steel 316 L, 2-sided foldable gold, Scope of supply: Large Astboerg Oakwood Uhrenbox Warranty and Service Card* Tourbillon: invented by the legendary watchmaker Abraham-Louis Breguet 1801 . There is a rotating bearing of the inhibition to reduce those inaccuracy which arises when the movement is changed in its orientation with respect to gravity. such errors are largely averaged out by the rotation about its axis within a minute. A high-precision mechanics, considering that the whole Tourbillon (weighs about 4 grams, the enveloping cage consists for example of titanium) every second is completely stopped and driven back. Against 1920 , the concept of Glashütte watchmaker Alfred Helwig as "flying tourbillon" evolved.** Regulator: it refers to a movement in which the pointer of hours and minutes is not concentric move in the same circle, but two circles are superimposed.