Credor “Lunar Rainbow” Raden GCLP991Model: Credor Lunar Rainbow Raden GCLP991 7R87 0AD0 Year: December 2015 Limited: 100 Pieces Features: The Complication. Whether were talking about mechanical movements or spring drives, the only high end Seiko movement with a Big Date complication is the 7R87 Credor Spring Drive. And even more surprisingly, there are only a handful of models that even use that movement and theyre all discontinued. The Technique. Raden is a traditional Japanese