Authentic Vintage Yixing Factory 1 "White Label" Era Hongni Teapot## Rare "Big Box Inverted" 4-Character Base Stamp — Circa 1984–1987
Up for sale/sale is a beautiful, highly collectible authentic vintage Yixing Zisha teapot produced by the famous state-run **Yixing Factory One (一廠)** during the mid-1980s "White Label" export era.
This piece has been fully vetted by diagnostic characteristics and is a textbook example of a utilitarian, high-functioning factory commodity pot from the golden era of state clay processing. It is perfect for both a seasoned collector or a tea enthusiast looking to experience genuine, unadulterated vintage Hongni clay.
### Key Collector Features & Diagnostic Proofs:* **The Base Stamp:** Features the highly sought-after **"中國宜興" (Zhong Guo Yixing)** square seal in the distinct **"Big Box Inverted" (大方章 倒國/倒宜) micro-variant**. The thick, organic, slightly irregular outer square frame is a prime example of a vintage metal/wood master seal strike.* **The Filter:** Features the classic **14-hole diamond pattern mesh filter** hand-drilled directly into the internal wall behind the spout. Organic clay burrs left by the traditional factory drilling tool are clearly visible around the perimeter.* **The Clay (*Hongni* / *Nianhongni*):** Composed of vibrant, pure, fine-grained red clay sourced directly from the factory's protected central mineral stocks before privatization. It features a natural, uniform matte texture that lacks the chemical additives or artificial coatings found on modern reproductions. It will season beautifully.* **The Form:** A low-profile, balanced **"Bi De" (扁得)** or flat-profile Shuiping variant shape with a crisp, straight conical spout and excellent proportions.
### Condition Report:* **Excellent Vintage Condition.** No cracks, chips, or repairs.* Lid flange is intact with a secure fit characteristic of 1980s piece-mold factory standards.* The interior shows authentic, clean tooling marks from production scrapers.* Shows light, charming hand-tooling human variations typical of this state-commodity production era (not a sterile, machine-stamped modern piece).Light Tea Staining inside
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