Tudor Black Bay GMT S&G 192740810848 Its sole power source is

Its sole power source is a mainspring

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Hand set Purple enamel and swarovski crystal

Crafted in 18K white gold

Tudor Black Bay GMT S&G 192740810848 Its sole power source isRoyal Jewelers is an authorized Tudor dealer in the Boston area and offers the Tudor Black Bay GMT S&G with Tudor's 5 year warranty. Five year Guarantee Five year transferable guarantee with no registration or periodic maintenance checks required Case 41mm steel case with polished and satin finish Movement Manufacture Calibre MT5652 (COSC)Self winding mechanical movement with bidirectional rotor systemBuilt in architecture Power Reserve Power reserve