How much is the error of a mechanical watch normal?
The instantaneous error range of the travel time of qualified mechanical watch products stipulated by the state is -70~+135 seconds per 24 hours.
How long does it take to wind up?
Normally, about a month is enough, because after the gears and parts of the mechanical watch are run-in and lubricated, the energy consumption will be less, and the energy stored in daily wear is enough to maintain normal operation.
How to check authenticity?
The back cover of the watch is pasted with an anti-counterfeiting code before leaving the factory. After receiving it, use the anti-counterfeiting code on the back cover and the code on the watch warranty card to check the authenticity on the official website.
Is the mirror scratch resistant?
General friction is no problem, but some artificial silicon carbide compounds can also have a hardness of 9, and the same level will definitely leave scratches on the mirror surface. Such as artificial marble, minerals, and some artificial equipment such as silicon-carbon-added metals.
Another point is that although the hardness of the mirror surface is hard enough, if you tap hard with a blade or sharp metal, it can also leave scratches on the mirror surface. Although the hardness of these blades and metal is not high, but with a certain amount of strength, It can hurt enough, just like water drops through a stone.