Another masterpiece from ZF - "Frost Gold" AP Royal Oak Series 15410BC "All-in-one CAL." The entire watch is treated with a new mold opening of the "Frost Gold" process. ZF applies the Golden Hammer Technology (also known as Florence Technology) The breathtaking brilliance produced by the surface treatment of the Royal Oak's unique case and bracelet construction is due to watchmaking craftsmanship. The main challenge was to apply this surface treatment to the entire watch without changing the definition of the Royal Oak. The simple lines of the form, it took months of trial and error at the ZF factory to change the metal surface so that it sparkles when it catches the light, while retaining the softness and flexibility of the bracelet. This is a very subtle alchemy , nothing has been added, nothing has been deleted, but the watch has changed. (The above details are even more amazing if you see the real thing). The newly developed all-in-one machine CAL. The balance wheel position corresponds to the genuine product at 7 o'clock, and the flat hairspring (Flat) .The gears and barrels on the deck are real and movable. The power reserve time is the same as the original version of 41 hours. ZF 15410BC "frost gold" masterpiece, welcome to appreciate it! ,