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The 5646-7040 is a rare model, and the only vintage Grand Seiko to have Arabic numerals as hour markers.
The dial of the watch has a starlight-like textured finish, and another unique feature is the watch’s round case featuring a textured bezel and short angular lugs.
The example available here is in great condition. Comes with vintage NSA bracelet.
Model: 5646-7040
Year: 1973
Diameter: 35.5mm
Lug to lug: 39mm
Lug width: 18mm
[ATTACH…
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