Seiko Cal. 4438 - 621

The 4438-621 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-e2090ab718ad]

Also known as: Tuna, Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

8.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1965

Related Models

• Seiko 6261-880
• Seiko 6145-316
• Seiko 4558-362
• Seiko 0738-446
• Seiko 4541-853
• Seiko 5237-950
• Seiko 5282-186
• Seiko 6278-653
• Seiko 6287-456
• Seiko 5268-187
• Seiko 6166-951
• Seiko 4459-582