The world time indicator on the case back is synchronised with Chaykin’s all-Russia dual time zone indicator. The construction looks mysterious, as at first glance it appears the two indicators are not connected at all. The sapphire disk allows the world time mechanism to be completely visible. Konstantin Chaykin is the recognised master of the “mysterious” watch, but he reveals the secret of this construction: “We placed a sapphire disk in the back of the movement, an idea just like in the “Levitas” watch. Via a pinion meshed with teeth around its edge, the rotation is transmitted through the movement from the upper disk of the time zone indicator, which is found on the opposite side of the dial.