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