Seiko 6138, 6139, Transmission wheel, no: 505613

• NOS SEIKO original part in factory sealed packaging.

• Seiko part number: 505613

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