Vintage “Blue Tit” Kingfisher Bird Stonewear Speckled 8oz Mug

Vintage what I believe is a “Blue Tit” Kingfisher Bird Stonewear/Ceramic Speckled 8oz Mug in excellent condition as shown. No chips or breaks, normal imperfections in the glaze. I'm noting the one on the front as it almost looks like a chip but is smooth and part of the design. Please review photos carefully for details on condition, design, amd measurements. Unbranded. A10 #Otagiri Style