Credor "Mother of Pearl" GCBZ999 GMTModel: Credor GCBZ999 8L36 00B0 Year: January 2011 Limited Edition: 110 Pieces Features: The Rarity. Produced in 2011 and limited to 150 pieces, this GMT Credor is full of surprises, both inside and out. A Mother of Pearl dial, with a floral pattern etched into the centre circle. And as eye catching as the design is, perhaps the most intriguing aspect is how rarely Seiko has used Mother of Pearl as a dial material. The Dial. Outside of a handful of