Two: Baldwin's lock core, the key is engraved with "Baldwin" and "Baldwin". Some fakes, the keys are very similar to the real ones, and the words printed on the keys are also very clear. Therefore, it may not be possible to judge the authenticity from the key alone, but if the printing is obviously bad, crooked and different shades, it is basically fake. The most direct thing is to remove the lock cylinder. The lock core of Baode An is engraved with steel seal, such as "09-S 1 1". The steel seal must be neat. If the numbers and letters on the steel seal are the same as the real ones, but they are oblique, they are also fake. Some fakes deliberately carve the initials "BDA" on the lock core, which is fake. If there are silver shields on both sides of the lock cylinder and icons on the shields, you can see whether the icons are clear and neat. In addition, we can only rely on the landlord's own eyesight and hands. Look at the workmanship of the lock core, and see if the carved icons and characters are produced by a big factory. Take it in your hand and weigh it. Does it feel heavy?