**Product Specifications:**
**Brand:** SHANGHAI
**Model:** XI, SHANGI, SHANCHA
**Series:** National Series - Classic Couple Mechanical Watch
**Design Philosophy:** The brand draws inspiration from Oriental aesthetics and philosophy to create timeless pieces that symbolize love and romance.
**Movement:** Automatic
**Water Resistance:** 5ATM
**Case Material:** Stainless Steel
**Crystal:** Synthetic Sapphire
**Clasp:** Stainless Steel Butterfly Clasp
**Features:** Day and Date Display
**Case Diameter:** Handcrafted, actual measurements may vary
**Design:** Elegant and romantic, with smooth and rounded lines exuding a sense of grace and elegance
**Dial:** Features delicate Roman numerals and a unique texture reminiscent of the passage of time
**Glass:** Synthetic Sapphire with high Mohs hardness for scratch resistance
**Back:** Transparent case back design
**Adjustment Method:** Manual winding and setting instructions provided for both men's and women's models
**Disclaimer:** Avoid exposure to magnetic fields and handle with care to maintain accuracy and performance
**Warranty:** Each watch is guaranteed to be a new, authentic product with excellent quality
Please note that the above specifications are based on the provided information and may vary slightly in actual products. For detailed technical specifications and maintenance instructions, please refer to the official documentation provided with the product.