This Seiko 5 Automatic from 1971 is a beautifully aged example of Seiko's iconic line of durable, affordable, and stylish mechanical watches. Powered by a 21-jewel self-winding automatic movement, it reflects the core ethos of the Seiko 5 series—automatic movement, day-date display, water resistance, recessed crown at 4 o’clock, and a durable case and bracelet.

Key Features:

• Movement: Automatic, 21 Jewels (self-winding, no battery needed)
  

• Year of Manufacture: October 1971 (based on serial number "170148" on caseback)
  

• Model Number: Likely from the 7009 or 6309 series (commonly used in Seiko 5 watches of this period)
  

• Case Material: Stainless steel, brushed finish
  

• Case Size: 36x40mm
  

• Strap: 20mm wide blue faux crocodile leather strap (aftermarket)
  

• Caseback Engraving: "SEIKO, WATER RESISTANT, STAINLESS STEEL, 7009-8730, 170148, JAPAN"