![]() The SBDB009 reincarnates this timepiece, using Seiko's proprietary Spring Drive technology to maintain a +/- 15 second per month accuracy rating, as well as a 72 hour power reserve. Inspired from a letter Seiko received by a proffesional diver in 1968, Seiko started to research and develope a watch that was not only resistant to water for depths as great as 350m, but also could withstand the shock of being hit against the ocean floor. The shrouded design of the Spring Drive Tuna Can SBDB009 originally took form in 1975 in Seiko's 6159 600m diver. The SBDB009 uses a titanium with DLC (Diamond Like Carbon) coated shroud with stainless steel components in the inner case, and an exclusive L-shaped packing material creating a seal that is both air and water tight. The Marine Master series of Seiko's widely proclaimed Prospex line has introduced one of their most iconic designs with their finest technology, creating the Seiko Prospex Marine Master 600m Spring Drive Tuna Can SBDB009. Overall, it’s nice to see Seiko continue with this recognisable case design and give it a fresh rethink outside the dive watch aesthetic it’s so famous for and with a smaller case size to widen that appeal.Seiko Prospex Marine Master 600m Spring Drive Tuna Can SBDB013 ![]() The accompanying strap is supple and not overly long but the buckle and metal keeper are of basic construction and nothing special. It’s so slim and hugs the smallest of wrists with ease. There’s no date on this model, but the 44mm variant has that at the 4 o’clock position.ĭaily wearing is a breeze. Overall finishing is typically Seiko, very good for the price. The Seiko Prospex Mini Tuna SUT403P11 comes with the classic Seiko wave engraved case back which is such a lovely feature and drilled lugs so you can experiment with the look of this watch as it works very well on a rubber strap, bracelet or a nato. It takes some getting used to, but legibility and bezel/crown operation are not compromised. Overall, with a lug to lug of only 41mm and case depth of just 11mm this watch wears small, even smaller than the stated dimensions as the dial aperture is compromised by the tuna case design and unidirectional 120 click bezel. But it works in the context of the collection it is intended for. You could argue this is all too much and I honestly would’ve preferred a complete matt/brushed finish all over. Polished hex-screws and the standard crown at 4 o’clock. Polished lugs, brushed outer case with polished cutout sections for bezel operation. ![]() Looking at the watch as a whole, you have a lot of textures and surfaces at play adding to the wrist presence. All on top of concentric grooved ridges giving a matt appearance, but throwing that off ever so slightly in varying light conditions. ![]() The standout feature for me is the bezel, overflowing with gorgeous details, like a lume plot at 12 o’clock, engraved minute markers and numerals at 3, 6 and 9. And finally, an ever so slightly domed hardlex crystal, which you hardly notice. The dial text is kept to a minimum with the familiar ‘prospex’ logo giving this watch a hint of its intended functional purpose. The blue dial has a little trick up its sleeve with a subtle sunburst effect which is always nice to catch a glimpse of, as with so many other dive watches you just get a plain coloured dial, and a thin rehaute with minute track gives a subtle appearance of depth. The second hand on the Seiko Prospex Mini Tuna SUT403P1 is particularly quirky with an arrowhead and black tail harking back to Seiko dive watches of old.
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