Having introduced a pair of PADI special editions – including the hit PADI “Turtle” earlier this year – Seiko is continuing its partnership with  the Professional Association of Diving Instructors (PADI), the world’s largest diver training body.

As PADI’s partner, Seiko has committed to support the Project AWARE Foundation, a non-profit established by PADI to promote marine conservation. The latest PADI watches are four Prospex dive watches, all being limited editions in the blue and red of PADI’s logo, but representing the diversity of Seiko’s dive watch line-up, ranging from a “Tuna” to a solar-powered diver for ladies.

The top of the line model is the Prospex Marinemaster Professional PADI “Tuna” (ref. SBBN039). Rated to 300m, the case is stainless steel, 47.7mm in diameter, and fitted with a blue-coated bezel to match the dark blue dial. It’s powered by the 7C46 quartz movement and limited to 700 pieces. Delivery is scheduled for January 27, 2017, with a price of ¥‎135,000 (about US$1290).

Next is the Prospex Scuba Diver PADI “Sumo” (ref. SBDC049). This is a 200m automatic diver, with the calibre 6R15 inside. The steel case is identical to that used on the standard “Sumo”, with a diameter of 45mm. Priced at ¥‎70,200 (equivalent to US$670), this will also arrived in store January 27, 2017.

Clockwise from left: “Tuna” SBBN039, “Sumo” SBDC049, Solar diver ladies’, and Solar diver men’s

The other two watches in the series are a match pair for men and women. Both are in titanium, with solar-powered quartz movements that will run for 10 months on a full charge. Each will be limited to 700 pieces, with the same price tag of ¥75,600 (or US$721). They will be available starting November 26, 2016.

The men’s Prospex Solar Scuba Diver PADI (ref. SBDJ015) is 44.1mm in diameter, while the ladies’ model (ref. SBDN035) is 38.8mm.

All four will only be sold at Seiko retailers in Japan.