**Product Specifications:**
**Brand:** Bestdon
**Model:** M, A, Hollow Mechanical Business Watch
**Movement:** 22 Jewels Automatic Mechanical Movement
**Features:** Multi-functional mechanical watch with visible mechanical operation
**Design:** Hollow mechanical design symbolizing the transition from boyhood to manhood
**Material:** 316L stainless steel case, genuine calf leather strap
**Water Resistance:** 5 ATM
**Power Reserve:** 48 hours
**Size:** Case width 41mm, thickness 11mm, strap width 20mm
**Mirror:** High hardness mineral glass
**Luminous:** Luminous hands and markers with energy storage for night visibility
**Additional Features:** Day and night display, GMT dual time zone adjustment, flying tourbillon
**Certifications:** Awarded "Guangzhou Watches & Clocks Well-known Brand" by Guangzhou Watches & Clocks Association
**Supplier Certification:** Audited Supplier on China Manufacturing Network
**Manufacturer:** Guangzhou Bestdon Watch Co., Ltd.
**Adjustment Guide:** Instructions for adjusting luminous hands and markers, day and night display, GMT dual time zone, and flying tourbillon
*Note: All data is manually measured and may have slight errors. Please refer to the actual product for accuracy.*
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