Seiko Mechanical "Mother-of-Pearl" Ring WatchModel: Seiko Mechanical "Mother of Pearl" Ring Watch Year: 1970s Features: The Design. Ive often lamented Seikos reluctance to embrace mother of pearl dials, especially given Japans connection to the sea. There are but a handful of MOP offerings throughout their mid to high end collections. So, like the Morpho ring, discovering a mother of pearl ring is more confusing than satisfying. Still, its a beautiful execution white tones shifting into pinks