Knowledge Center

Professional Authentication Platform

Log InRegister

Some specifications for this reference are on file; the record is incomplete.

Seiko · King Seiko

King Seiko

Ref. 44-9990 — “44KS”

discontinued44KS — Daini manual-windPartially documentedLast reviewed Not yet reviewed

Missing informationCore fields not yet documented for this reference: Water resistance

Lineage44-999045-7001 →Compare with next

Reference photography not yet on file

The 44KS, produced by Daini Seikosha. A two-digit caliber code — '44' rather than a four-digit number — which is why the standard four-digit Seiko case-number parsing does not apply to references of this era.

Some specifications for this reference require verification against manufacturer documentation.

At a glance

Brand
Seiko
Collection
King Seiko
Reference
44-9990
Production
1964–1968
Caliber
4420A
Case diameter
36.5mm
Case material
Stainless steel

Related references

Reference family timeline

Every generation in this lineage in production order. Spans are as documented; an open end means the reference is current or its end year is not established.

  1. 44-9990“44KS”

    King Seiko · 4420A

    1964–1968This reference
  2. 45-7001“45KS”

    King Seiko · 4502A

    1968–1972
  3. 5626-7000“56KS”

    King Seiko · 5626A

    1968–1975
  4. SJE083

    King Seiko · 6L35

    2022–