Seiko Cal. 7138 - 781

The 7138-781 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 7138 caliber with 28j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-29881b33d9cb]

Also known as: Sumo, Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

160m

Dial Color

White

Jewels

28j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1969

Related Models

• Seiko 4593-176
• Seiko 7019-726
• Seiko 5665-624
• Seiko 6152-908
• Seiko 5244-221
• Seiko 6641-675
• Seiko 0773-645
• Seiko 6678-252
• Seiko 3830-256
• Seiko 5250-388
• Seiko 3841-990
• Seiko 4563-640