Seller Notes (please read): 
I am selling this watch "as-is" to clear space in my collection. I have done my best to describe the condition accurately.

Please view the high res photos (and 4k video) taken during this listing creation (April 2, 2026) for exact view, that is what you will receive. I don’t have the box or anything but it will be very securely shipped in a nice wooden Hamilton watch box (see 5th photo). The band is not the original band, I will also include a SEIKO band as seen in photos (see 6th photo).

This is a one of a kind gem! Very beautiful blue cut! Message me if you need more photos.


Condition Report
• Movement: overhauled/serviced. The Hi-Beat caliber 5645 is running strong and keeping excellent time.
• Case: In excellent vintage condition. The case edges and lug facets remain incredibly sharp, appearing unpolished or very lightly finished, which is rare for this reference.
• Quick-Set Date: Fully functional. The date snaps over cleanly via the crown at the first click. This is a common failure point for this movement, so a working gear is a major plus for this specific piece.
• Dial: The original blue dial is in superb condition with no "edge rot" or spotting—the color remains vibrant and deep.
• Crystal: Original faceted "cut glass."
• Caseback: Features the original Gold GS Medallion, which is well-preserved and crisp.
• Band: Comes on a new aftermarket black leather strap with a silver-tone buckle.
Specifications
• Brand: Grand Seiko
• Reference: 5645-8000
• Year: 1971
• Case Size: 36mm (excluding crown)
• Lug Width: 18mm
• Movement: 5645 Hi-Beat Automatic (28,800 bph)
• Material: Stainless Steel