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The vintage Otagiri "The Sea" mug is a highly collectible piece of mid-century to late 20th-century coastal Japanese stoneware. Produced by the Otagiri Mercantile Company (OMC) in Japan, this specific pattern is best known for its striking deep cobalt or navy-blue high-gloss glaze.
Design & Key Features
• The Graphic Motif: Features a distinctive wrap-around design of white seagulls soaring over stylized ocean waves. Some variants also incorporate subtle gold-tone bird silhouettes or outlines.
• Gilded Trim: A defining characteristic of "The Sea" collection is a thin, elegant gold-tone band painted along the top rim.
• Material & Build: Crafted from heavy, durable ceramic or porcelain-enhanced stoneware typical of Otagiri's high-quality post-war manufacturing.
• Dimensions & Capacity: Standard mugs measure approximately 4 inches tall and 3 inches in diameter, holding about 10 fluid ounces.
Collector Tips & Identification
• Authenticity Marks: Look for an original gold or yellow foil "OMC Japan" sticker or an imprinted "Otagiri Japan" backstamp on the unglazed foot of the underside. Because foil stickers frequently washed off over the decades, a clean bottom with just a textured ring is common.
• Care Instructions: Due to the delicate metallic nature of the gold-rimmed trim, these mugs should never be placed in the microwave and are strictly hand-wash only to prevent the gold from wearing away.
• Current Market Value: Individual mugs in excellent vintage condition typically trade between $10 and $25 on secondary marketplaces like and Etsy.
The vintage Otagiri "The Sea" cobalt mug was manufactured during the 1970s.
Production Timeline & Context
• The 1970s Peak: The specific high-gloss cobalt blue aesthetic featuring stylized white seagulls and a gilded gold rim was part of Otagiri's coastal expansion throughout the 1970s.
There is a little bit of wear of the gold gilt on the rim of the mugs but the gold in the body of the mug is intact. This was taken into consideration when pricing.
