Here’s a brand new Tuna 300M Quartz for 2020. This is the Japanese ref. you’ll have to hold tight for the US/ EU ref.

SBBN045 gets a Stainless steel inner case and shroud with Seiko’s DiaShield hardened coating. Measurements are as follows: H46.66mm × W47.69mm × D14.13mm.

The case is fitted with inner AR-treated curved Sapphire crystal. It has a magnetic-reluctance as well as a water-resistance to 300 meters.



Powering the watch is a Seiko Quartz caliber 7C46 with an accuracy of ±15 seconds per month and battery life of 5yrs. Functions include: hrs, mins, day and date.

The Prospex Diver Pro 300M ref. SBBN045 has a Japanese MSRP of 150,000 JPY+tax.



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