Authentic second-hand piece - automatic 6R20 calibre - sourced from the original listing
Seiko Premier Automatic6R20-00A0
Automatic - 42 mm - day-date - power reserve indicator - stainless steel
Seiko Premier Automatic 6R20-00A0 with 6R20 movement, power reserve indicator, day-date display, 42 mm case, and 100 m water resistance.

6R20 calibre
A mature mechanical movement, not just a flashy one
The story of this model starts with 6R20, a calibre positioned by Seiko in the upper mechanical segment.
SPRON 510 brings a mainspring alloy known for strong elasticity and consistent power delivery.
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