This is the original dial spacer holding ring for the Seiko Marine Master / MM300 / Ananta / 

This spacer suits among other's on the following calibre- / case numbers:

6S37-00E0, 8L35-0010, 8L35-00H0, 8L35-00K0, 8L35-00N0, 8L35-00S0, 8L35-00R0, 8L35-00X0, 8L35-00R0, 

6S28-00F0, 6S28-00A0, 6S28-00G0, 6S28-00B0, 6S37-00B0, 6S37-00C0, 8L21-00A0, 

8L21-00B0, 8L35-00D0, 8L35-00F0, 8L38-00A0, 8L35-00B0, 8L35-0020, 8L35-0030, 8L35-0040, 8L35-00C0, 8L35-00G0, 

9S55-0050, 9S55-0010, 8S55-00C0, 9S54-0030, 9S54-00A0, 

Related models:

SAEH003, SBDX001, SBDX014, SBDX017, SBDX023, SLA017, SLA019,  SLA021, SLA033, SLA023, 

SAGH001, SGH007, SGH009, SGL001, SGP005, SBDS001, SBGW005, SBGW001, SBGW014, SSD001, 

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