A rare and collectible piece from the iconic Seiko 5 line, this Seiko 5 Moonphase 6347-5000 combines vintage charm with mechanical reliability. Produced in the late 1970s to early 1980s, this model stands out with its distinctive octagonal case, moonphase complication, and starry midnight dial.

Specifications

• Model: Seiko 5 Moon Phase 6347-5000
• Movement: Seiko Cal. 6347A – automatic, 23 jewels
• Functions: Time, moonphase, date
• Dial: Black with gold accents, moon and stars motif
• Crystal: Mineral glass
• Caseback: Stainless steel, screw-down
• Case size: 36 mm (including crown)
• Lug width: 18 mm
• Wrist circumference: about 19 cm
• Manufactured date: October 1986

Condition

• Dial & Hands: Excellent condition with beautiful gold detailing and functioning moonphase display.
• Crystal: Original, showing scratches and wear.
• Case & Bracelet: Light scratches and wear consistent with age, unpolished.
• Movement: Runs and keeps time, though accuracy has not been tested over extended periods. Service history unknown.
  

How to set

• Date: Pull out the crown one click, turn clockwise
• Moonphase: Pull out the crown one click, turn counter-clockwise (please refer to the moon calendar to set the moonphase correctly)
• Time: Pull out the crown two clicks, turn counter-clockwise to advance

Product File
Brand: Seiko
Product: Wristwatch
Collection: Vintage
Movement: Automatic
Display: Analog