OceanicTime Archives


SEIKO PROSPEX Marinemaster Professional 1000M

This is SBBN040, the Japanese equivalent of Ref. S23626J1. The watch is a Limited Edition of 1978 pieces, referencing the year in which the first Tuna was born.

The watch is powered by a highly accurate (±15 seconds per month) Seiko 7C46 Quartz caliber with a battery-life of approx. 5 years.

Its shrouded watch case that gave way to its Tuna can nickname measures: H49.4mm x W49.4mm x D15.3mm. It is fitted with a Sapphire crystal.

Divers features incl.: divers bezel, a screw-down case-back and crown, magnetic-resistance and water-resistance to 1000 meters. The watch’s hands and markers are with Seiko LumiBrite.

SBBN040 is delivered in a special presentation box. Each of the watches in the LE series gets its serial number engraved on its case-back.

Its Japanese MSRP is 240,000 JPY+TAX. Not a fan of Quartz? Check out SBDX014G.


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