SEIKO Special edition Prospex SRPH77K1 — Specially adjusted


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SEIKO Prospex SRPH77K1

This is a like new special edition SEIKO Prospex SRPH77K1 Tuna.  This was specially adjusted and timed by Wilson Watch Works.  It runs within chronometer tolerances.

Description: Special edition Seiko Tuna diver that we purchased new for review and careful field testing. The Same legendary Tuna Can case design in a smaller wearable size. Includes original Seiko box and papers with hang tags and warranty card stamped February 22, 2022.

Seiko Prospex Antarctica Scuba Tuna ‘Save the Ocean’ This timepiece is inspired by the landscape of the world’s largest marine sanctuary – Antarctica. The dial’s graduated color and texture echo the white-blue views of the area created by light reflected on the ice, whilst the penguin footprints at the 10 o’clock position represent the dwindling numbers of its inhabitants. Seiko donates proceeds from these ‘Save the Ocean’ models to sea conservation and environmental organizations. The shape of this watch is affectionately nicknamed by Seiko fans as a ‘Tuna’ – because of its larger diameter and bold shape like a tuna tin – loved for decades since its release. Seiko Prospex watches are designed for sports lovers and adventure seekers in the water, in the sky or on land – and are robust for everyday wear, whatever the environment. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards.   Be sure to check out the Seiko Marine Master too.

Brand: Seiko

Model: SEIKO Prospex SRPH77K1

Gender: Men’s

Movement: Automatic

Engine: Seiko 23 Jewels Automatic winding Cal. 4R35

Power Reserve: Up to 41 hours


Water Resistance: 200 meters / 660 feet

Calendar: Date display at the 4 o’clock position

Functions: Date, Hour, Minute, Second

Uni-Directional Rotating Bezel


Case Size: 43.2 mm

Case Thickness: 12.6 mm

Case Material: Stainless Steel

Case Shape: Round


Dial Type: Analog

Dial Color: Blue

Glass: Hardlex Crystal

Luminous Hands and Indexes

Dial Markers: Index


Band Type: OEM Seiko band with stainless steel buckle and keeper

Band Material: Silicone

Band Color: Blue

Band Width: 20mm


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