Description:
This is a vintage SEIKO Advan automatic watch, model 6106-7680, featuring a striking black dial and a robust stainless steel case. The Advan series is highly collectible for its unique 1970s futuristic styling and faceted crystals.

Specifications:
- Brand: SEIKO
- Model: Advan
- Reference Number: 6106-7680
- Movement: Automatic (Caliber 6106, 25 Jewels)
- Case Material: Stainless Steel
- Dial Color: Black
- Features: Day/Date display, Hacking seconds
- Case Diameter: Approx. 38mm
- Lug Width: Approx. 18mm
- Era: 1970s

Condition:
- Accuracy is unknown as it has not been professionally timed or serviced recently.
- Please carefully inspect the high-resolution photos for the exact physical condition and dimensions.
- As this is a vintage timepiece, please expect signs of wear such as scratches, scuffs, or aging consistent with its age.