Seiko 4420-9990
c. 1965–c. 1966
Years estimated from 2 dated marketplace listings; seller-stated, unverified.
Variants
No variants documented yet.
Reference specifications
- Brand
- Seiko
- Reference
- 4420-9990
- Production
- c. 1965–c. 1966
- Case diameter
- 36 mm
Specs shared by all variants. Variant pages show where a variant differs.