Credor “Big Date” GCLP993Model: Seiko Big Date GCLP993 7R87 0AC0 Year: July 2016 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 the movement and theyre all discontinued. The Design. The GCLP993 resembles the smooth surface of a piano key. Adorned with painted a