OTAGIRI lot of four Coffee Mug Seashell 🐚 Ocean Coffee Cup Vintage Japan💙

Lot of four Sea Shell Coffee Mug by Otagiri, made in Japan Beige speckled interior, smooth blue rim, bisque finish green body stoneware with beige embossed textured seashell, Marked/signed on underside with "Otagiri" and "Japan" Measurements: 3 1/2 " tall x 3 1/8 " rim to rim diameter, weighs 11 oz Condition: Excellent, no chips, no cracks, one mug has a line in the glaze think it’s from manufacturing. see photos