The Seiko Prospex SRP641, affectionately known as the Baby Tuna, features a safeguarding enclosure crafted from black ion-plated stainless steel. This enclosure slightly increases the case diameter to 46.5mm. The crown, adorned in goldtone, is now positioned at four o'clock. Enclosed within the case is the 24-jewel Seiko caliber 4R36 automatic movement, which offers both self-winding and hand-winding capabilities, along with hacking. The robust Seiko LumiBrite luminescent substance on the goldtone hands and markers grants the watch the same splendidly radiant attributes that propelled the Seiko Monster into an immense sensation.
What you need to know:
Movement:Seiko 24-jewel Automatic (self-winding, hand wind)
Case:Black ion stainless steel, 46.5mm x 13mm thick x 51mm lug to lug
Back:Engraved screw-in back
Crystal:Domed Hardlex Mineral
Band:Seiko black silicone-rubber dive strap. 20mm
Water Resistant:200 meters