The main thing (when analyzing the price) is the elaboration and technical refinement used (technical term: Complication).
Normally the quality mechanisms cost a little more money than the simpler versions. This has to do with both the pieces worked by hand and with the assembly of the pieces that takes place with the mechanisms of the most renowned suppliers, where they are dedicated watchmakers who perform these works. A buyer of a replica watch with an automatic mechanism not only pays for the finish and replica watches exclusivity but also for the devotion with which the piece has been made.
This dedication is also detected by someone who does not consider himself an expert in the field if he takes a look at the mechanism.
This is what I should keep in mind when buying replica watches with an automatic mechanism.
The vast majority of manufacturers use ETA gauges. This Swiss manufacturer that belongs to the Swatch group is the largest and most recognized producer of mechanisms. Manufacturers of high-end watches such as Glashütte or André Belfort basically rely on the mechanisms of the ETA house. Because in most cases, watches do not use the mechanisms in their original version but, in general, they are conditioned according to the needs and taste of replica Rolex watches manufacturers to better meet the demand of their most demanding customers .
However, today there are manufacturers who develop their own mechanisms and these are the ones they use in their replica watches collections, some examples are Rolex replicas. These mechanisms are even more replica watches expensive than the "more conventional" ETA house.
In general, we can say, however, that all the mechanisms of replica watches large houses are extremely accurate. For what the buyer, the decisive thing must be his personal taste.