Case material: Steel; Charge: Automatic; Conditions: New Presentation condition : With boxes and all papers; Model: Silverstone RS Price on request Gmtbroker Reference: 2TSAS.B02A.C11 graham silverstone tourbillograph toubillon 48mm stainless steel with black dial chronograph automatic * * you will not see manyof these around! * * limited & numbered edition of 50 pieces worldwide! this watch features: - polished stainless steel case with a fine brushed finish to the bezel ring & top of lugs. - flat matte black dial with recessed sub-dials that are finished with a finely engraved concentric circle pattern. - polished stainless steel hands with black colored luminous fill. - applied polished stainless steel arabic numeral hour markers. - tachymeter scale printed on the bezel flange under the crystal. tourbillon: - located at the top left corner of the dial. - crafter using 48 components & weighing merely 0.485 grams. - patented completely see-through from one side of the case to the other. - 60 second tourbillon with a hand affixed to the mechanism doubling as a seconds hand. chronograph/stopwatch functions: - column wheel with polished segments and black low-friction coating, visible through the transparent case back. - large central seconds hand counter. - 30 minute counter sub-dial located at the 3 o'clock position. - 12 hour counter sub-dial located at the 6 o'clock position. - graham caliber g1780, beats at 28,800 vph, contains 34 jewels & has an approximate power reserve of 48 hours. fitted with a ruthenium finished &