NOS Seiko Crown 55W37E/55W41E/55W41NS/55W41ES1 for Grand Seiko 4420-9000 and all 4520/4522 models.

Measurements:

Diameter: 5,5mm

Height: 3,2mm

This is the original crown for the following Grand Seiko models (all 4 references were used for the same crown):

4420-9000 (fine knurled variant)

4520-7000

4520-7001

4520-7010

4520-8000

4522-7000

4522-7001

4522-7010

4522-8000

4580-7010 VFA