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It was developed from Red Oranda decades ago. The whole body is red and there is a sac on the head. It is quite rare that the center of the sac is white like a square jade stamp, hence the name "Jade Stamp on Head". Those with stout sacs and white square are A-class. Compared to White Oranda with Red Cap, fewer baby fish can pass the screening criterion on the jade stamp; therefore, it is also regarded as high-ranked goldfish.
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