Seiko Cal. 3878 - 750

The 3878-750 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3878 caliber with 35j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-a2e48b8c3a79]

Also known as: Tuna, World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1997

Related Models

• Seiko 7099-871
• Seiko 5629-698
• Seiko 6620-890
• Seiko 4568-177
• Seiko 6241-233
• Seiko 7021-897
• Seiko 7196-960
• Seiko 5228-405
• Seiko 7064-601
• Seiko 6154-501
• Seiko 4497-986
• Seiko 6380-310