This is the movement we need in this replica
or improved version of the Ronda 2538 budget microrotor from the late 1980s.
http://forums.watchuseek.com/f72/chinese-microrotor-movements-439829.html
http://www.tractionink.com/watch_wiki/index.php?title=Microrotor
In early 2011, Sea-Gull presented a prototype microrotor watch of a thinness unprecedented in Chinese automatics. Production is scheduled commence towards the end of the year, however there have been reported delays while Sea-Gull fine-tunes the design for optimum winding efficiency.
Another microrotor of presumed Chinese origin is known to exist. It features a central second hand and date mechanism so is less thin than the Sea-Gull. The manufacturer is unknown but the movement has been in production since 2004 or earlier. It is extrememly rare and of unknown quality.