I could go on and on about the http://www.speedroc.com/replica-breitling-chronomat-41.html movements - but I will spare you. They are all hand-made and assembled in Japan by highly trained people. The movements are just like mechanical movements, but with a big difference. No escapement. Instead, power is sent directly from the mainspring to the rest of the movement. But there is a catch. The power is regulated by something called a glide wheel the slows down the power moving out of the mainspring. Think of it as a brake. The degree that the power is slowed is regulated by a oscillating quartz crystal. The quartz crystal moves when electrical impulses are applied to it. This electricity is generated right there, from the power moving out of the mainspring barrel. The real trick for the watches was having a long enough power reserve, due to the need of having it generate a small electrical current. It took TAG Heuer almost three decades to make a practical Replica movement. The replica breitling Bentley Barnato have 72 hours of power reserve on average (closer to 100 hours with the chronograph function activated, opposite of standard mechanical watches). Each of the replica tag heuer Formula 1 Chronograph watches have different movements. The chronograph model has a TAG Heuer caliber 5R86, while the GMT has a TAG Heuer caliber 5R66. You can see an image of the 5R86 movements above, as well as a cool diagram with actual parts that I photographed while at the Replica manufacture in Japan (click on that image to make it larger). TAG Heuer Replica movements are accurate to within about 1 second a day (which is pretty much equivalent to quartz movement based watches). So with a Replica movement based watch, you really have all the things you love about mechanical watches with the accuracy of a quartz movement. Oh, and just to be clear, the mainspring is powered by both the Watches rotor or hand-winding via the large crown. In all ways, these movements are top notch from construction to performance. Really the apex of what TAG Heuer is known for. Hard to think of complaints about the watches. I would have liked for there to be a TAG Heuer signature or logo on the crown, but that is a minor point. Also, the GMT hand is kind of strange to adjust until you get the hang of it. It is totally independently adjustable (thankfully in one hour increments), but the process of doing so is different than in Swiss movements. Otherwise the watches are hard to beat. Even though they are pricey, they are an incredibly good value in comparison to European watches. http://mytravelon.net/profiles/blogs/breitling-bentley-solar-watch http://www.artbracket.com/profiles/blogs/breitling-bentley-solar-watch http://www.facecool.com/profiles/blogs/breitling-bentley-solar-watch http://inskoolz.com/profiles/blogs/breitling-bentley-solar-watch