Vintage Japanese Folk Art Stackable Ceramic Mug

This is a vintage stackable ceramic mug, likely of Japanese origin, dating from the late 1960s to the 1970s. The piece is crafted from a heavy stoneware or earthenware featuring a warm ochre or honey-brown glaze. The central motif consists of a dark brown transfer-print or hand-stamped folk art design depicting two stylized birds facing a central flower, characteristic of the 'Sone' or 'Otagiri' style common in mid-century Japanese export pottery. The lower portion of the mug features a recessed, vertically ribbed base designed for stable stacking. The handle is a standard 'C' shape, proportionate to the cylindrical body. Physically, the glaze appears glossy with some minor surface scratches consistent with age. There are no immediate signs of large chips or cracks visible on the exterior, though there is a slight dulling of the finish near the rim. The interior appears to be glazed in a slightly darker mahogany tone. This style is highly collectible for those interested in retro kitchenware and 'Otigari'-style stoneware due to its sturdy construction and charming, rustic aesthetic.