Seiko 6138-870931, Day star with dial disc, english/spanish

• SEIKO original part in very good used condition.

• Seiko part number: 870931

• Fits: 6138 A/B, 6139 A/B

Technical data: SEIKO 6138A

• 21 jewels, automatic wind, chronograph, 60 s, 30 min, 12 h counter, day-date.
• S: = 27.0 mm.
• H: = 8.0 mm.
• N: = 21.600 A/h.
• Power reserve: 45 h.

Versions:

• 6138A: 21 jewels.
• 6138B: 21 jewels, modified switch mechanism.
• 6139A: 21 jewels, without 12 h counter.
• 6139B: 17 jewels, without 12 h counter, modified switch mechanism.