The Seiko SRPG59, known among collectors as the "Baby Tuna," is a serious diver's watch that balances durability, comfort, and iconic design. With its distinctive protective shroud and ocean-inspired blue-and-white colorway, this watch is built to withstand the deep but fits right into everyday life as well.
Key Features:
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Movement: Seiko 4R35 automatic with manual winding, 41-hour power reserve, 23 jewels, and hacking seconds
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Case Size: 43.2mm diameter, 12.6mm thickness, 44mm lug-to-lug
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Material: Stainless steel case with silicone strap
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Crystal: Seiko’s proprietary Hardlex for improved impact resistance
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Water Resistance: 200m / 660ft ISO-certified for diving
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Bezel: Unidirectional rotating with LumiBrite
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Visibility: LumiBrite on hands, indexes, and bezel for enhanced low-light legibility
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Other Details: Screw-down crown, screw case back, and SPECIAL EDITION engraving on case back
The Seiko SRPG59 is part of the Prospex line—Seiko’s professional-grade series built for adventure, exploration, and diving. Referred to as the “Baby Tuna” due to its resemblance to the original Seiko Tuna dive watches, this model features a compact 43.2mm stainless steel case with Seiko’s signature outer shroud for added protection.
It runs on the Seiko Caliber 4R35 movement, an automatic mechanical engine with 23 jewels, a date complication, hacking seconds, and manual winding capability. The power reserve stands at approximately 41 hours, making it a reliable everyday choice.
The dial is bold and legible, with prominent hands and markers coated in LumiBrite, along with lume on the bezel. Seiko’s proprietary Hardlex crystal enhances scratch and impact resistance. The silicone strap ensures a secure and comfortable fit, whether worn on land or underwater.
This model is ISO-rated for 200m water resistance and includes essential diver’s features: screw-down crown, screw case back, and a unidirectional bezel. It’s also a Special Edition, with the engraving to match on the case back.
A practical tool watch with serious heritage, the SRPG59 is a versatile addition to Seiko’s Prospex family and a fan favorite in the world of affordable dive watches.
