1, quartz watch, in fact, is the electronic watch, with the battery. Very accurate when you go, almost 0 error can be reached.
2, mechanical watch sub-chain and automatic winding two. Hand relative to the chain when the relative speed to be allowed to go some.
3, mechanical watches 24-hour error of 15-30 seconds is a normal phenomenon. Swiss Observatory level clock movement, the minimum error of up to 4-5 seconds. But this is only the best case, not absolute, or fixed in this range. Because the mechanical watch will change with the temperature, magnetic field, collision shock, altitude and other factors.