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In what year was Olma's automatic double calendar mechanical watch produced?

Born in 1968. 1906, Mr. numajeannin established the first watchmaking factory Olma and registered the Olma brand. According to relevant information, Olma automatic double calendar mechanical watch was born in 1968 and sold. This watch took two years to make in olma factory. Many people bought it on the day of release and liked it.