Seiko

Baby Tuna

Name: Seiko Baby Tuna
Brand: Seiko
Availability: InStock

47.5mm

Low $308

Median $375

High $475

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The Seiko Baby Tuna brings the Tuna family’s protective shroud to an automatic diver that feels built for everyday knocks rather than saturation diving. Its broad bezel, bold hands, and deeply recessed case give it a tool-watch presence, while short lugs make that substantial diameter less daunting on the wrist than the number suggests.

For a straightforward choice, start with the 4R36-powered SRP637 or SRP641: you get hand-winding and hacking, useful conveniences when setting a watch in a rotation. The shroud is the detail to examine closely. Its retaining screws should be intact, and the bezel should turn without catching against it; damage or a poorly fitted replacement can compromise that relationship. Also test the crown through winding, setting, and the day/date adjustment, keeping quick-setting away from the calendar-change period.

MovementAutomatic

Caliber4R36

Case MaterialStainless Steel

Case Size47.5mm

Water Resistance200m