The base bears a cobalt-blue six-character seal-script reign mark reading “Made during the Qianlong Reign of the Great Qing Dynasty” (Da Qing Qianlong Nian Zhi), arranged in the standard three-column format used for imperial kiln wares. This is one of the most enduring and highly recognizable official marks used throughout the Qianlong reign.
The inscription follows the strict court regulations for imperial porcelain marks, executed in a refined “iron-wire seal script” style. The brushwork is even and controlled, with consistent stroke thickness, crisp angular turns, and smooth, upright lines. The beginning and ending of each stroke are cleanly handled, without any sense of hesitation or irregularity.
The composition of the mark is carefully balanced and symmetrical, with a disciplined and orderly layout. Spacing between characters is precisely regulated, creating a dignified and harmonious structure that reflects the refined imperial aesthetic of the Qianlong court. The cobalt-blue inscription is deep and lustrous, penetrating into the glaze rather than appearing superficial, with natural and subtle diffusion that complements the fine white porcelain body.
The standardized Qianlong reign mark was written or traced under strict supervision by court artisans of the imperial kilns, with very few deviations in structure or execution. It serves as a key criterion for identifying authentic Qianlong imperial porcelains. This formal six-character seal-script mark was widely used on monochrome-glazed wares, enamelled porcelains, and relief-decorated imperial ceramics, representing one of the most direct visual symbols of the highly regulated official kiln system during the Kangxi–Yongzheng–Qianlong golden age of the Qing Dynasty.