Base of an Antique Chinese Yixing Zisha Stoneware Vessel

This image shows the underside or base of a ceramic vessel, likely a teapot or small jar, crafted from Chinese 'Zisha' (purple clay) stoneware, often associated with the Yixing region. The material exhibits a characteristic warm, reddish-brown Ocher or terracotta hue with a fine-grained, unglazed texture. A primary feature is the impressed rectangular seal mark in the center, which contains traditional Chinese characters, typically representing the name of the artisan, the workshop, or a poetic studio name. Above this stamp is a secondary incised mark resembling the numeral '2' or a stylized 'Z', which may be an inventory mark or specific kiln designation. The base shows concentric circular grooves, indicating it was finished on a potter's wheel. Regarding condition, the piece shows significant evidence of age and use. There are visible chips and abrasions along the foot rim, exposing the lighter interior body of the clay. Scattered white mineral deposits or 'bloom' are present across the surface, possibly from long-term storage or interaction with water. The craftsmanship appears traditional, with the seal being well-defined despite the wear. This style and method of marking are consistent with late 19th-century to early 20th-century production, though Yixing ware has a history spanning several centuries.