Seiko Cal. 6644 - 520

The 6644-520 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6644 caliber with 25j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-20b4cdf221d3]

Also known as: Panda, Crown

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

36mm

Case Thickness

10.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1970

Related Models

• Seiko 6362-754
• Seiko 0715-522
• Seiko 3876-197
• Seiko 4447-748
• Seiko 6663-999
• Seiko 6371-744
• Seiko 3845-971
• Seiko 6117-759
• Seiko 7019-125
• Seiko 4468-265
• Seiko 3882-618
• Seiko 0751-607