Seiko Release Classic Series Tonneau Enamel for 2026

Seiko has never been a stranger to barrel-shaped case designs, better known in watch collecting circles as tonneau. One of their most famous dive watches, the Turtle, is a variation of the classic tonneau design with sweeping round flanks and a round dial. However, the more typical tonneau watch design (such as those from Richard Mille) feature a dial that echoes the barrel shape of the case with the top and bottom at 12 and 6 o’clock mirroring the flat edges. Seiko used this more traditional tonneau shape in 2017’s Classic Series Tonneau, which is today revived almost a decade later.

Starting with the updated case, it has that signature barrel shape we’ve been discussing with long, curving flanks that lead into lugs on either side of the flat ends of the barrel design. It has a width of 35.9mm with a length of around 45mm, so it wears well on the wrist. The tonneau shape is naturally bulkier than a round case so while it might seem slim on paper, in the metal it has a good amount of heft to it. While it’s not giant there’s a reasonable height to the piece too, with a thickness of 12.5mm.

For the dial, it’s a clean enamel piece in white similar to the 145^th Anniversary Presage released earlier this week. The similarity is intentional because both watches are inspired by the Timekeeper, the first pocket watch produced by Seiko (known as Seikosha at the time) in 1895. That means roman numerals and for the Tonneau, a 6 o’clock subdial, which displays a 24-hour scale. The use of enamel creates a smooth, pristine finish that in conjunction with the black timing scales creates a very classical look. It wouldn’t look out of place in the Cartier Privé collection.

Providing the watch with a 72-hour power reserve is the automatic calibre 6R5H, which is the 24-hour subdial edition of the 6R55 series. It’s visible through the watch’s exhibition caseback where you can admire the finishing such as the stripes across the gold coloured rotor. You can also see the frenetic motion of the balance spring, which let’s be real is the main thing we want to see, the beating heart of the movement. The movement is the main upgrade compared to the 2017 edition, other than a few aesthetic tweaks here and there, as the older version used the 6R15.

The Seiko Classic Series Tonneau is priced at £1,400, which is the upper mid-range of the Classic Series Enamel models which run from £900 – £1,700. I’m actually surprised that it’s not the most expensive model in the range given the extra effort involved in producing a tonneau case and matching dial in enamel. If you’re looking for a dress watch that stands out thanks to a distinctive shape, look no further.

More details at Seiko.