Vintage Seiko Rectangular Watch 5Y91-5020 R1 | Seiko Tank 。The product is a rare 1980s Seiko Tank Quartz 5Y00-5020 wristwatch designed for men. This analog watch features a quartz movement, a classic design by Seiko, and has a new battery installed for reliable timekeeping. A sought-after collectible for watch enthusiasts, this vintage timepiece offers a unique and stylish accessory for those who appreciate classic horology. Reference: 5Y00-5020 Serial: 760836 Case size: 26mm x 34mm Movement: Seiko 5Y00 Ouartz Crvstal: Mineral Strap Size: Fits up to 8.8 inch wrist size