3 Time Zone GMT. In-house Manual-Winding Tourbillon with 110 Hours Power Reserve Grand Complication Masterpiece with a very unusual designer architectural movement. Model: 1T1AW.S01A.C01B Limited Edition of 10. This is number 8/10Size: 41.5mm with out crown (43mm with crown). Versatile size for both formal and casual occasions. Wears extremely comfortably on the wrist. Dial: Multi-lawyered dial with silver hand-guilloche sunray patterns on the upper dial. Lower dial opens up to showcase the tourbillon cage with small second, and exhibits the perlage finishing on the lower dial. The bridge of the tourbillon is hand-polished black steel (very time consuming, essentially repeated polishing the steel until it turns mirror-like). High polished silver hands. Silver Roman numerals. Movement: In-house Arnold and Son grand complication manual-winding tourbillon movement with 3 independent time zones and 110 hours power reserve The sapphire crystal display back shows a strong and unusual movement architecture carefully designed just for this piece. The 3-dimensional and symmetric architecture is just as mesmerizing as the movement finishing, which is among the best that I have seem: The raised movement is finished with traditional cote-de-geneve patterns, and the bevelled edges exhibit anglage techniques. Every screw is mirror polished, and every ruby sink is polsihed. The massive amount of perlage on the base plates form a very interesting contrast with the cote-de-geneve finishing, and results in a stunning interplay of lights when viewed from different angle. This masterpiece is mesmerizing to look at from both the front and the back. Comes with original Arnold and Son large 18K WG pin buckle.Arnold & Son