The OM factory has recently upgraded the 15500, which makes it closer to the original version, but its thickness is 11mm, the original version is 10.5mm, they are different because of the movement, the OM factory still modifies the appearance of the 9015 movement, make it look like 4302 movement. The ZF factory transformed the 9015 structure movement to make the plate and rotor work. It is not a decoration, it is integrated with the movement, so it is very stable,Same stability as Swiss ETA movements,Therefore, the best version is still ZF. The following are some real photos of ZF. It is almost the same as the original version. A top replica watch