First introduced three years ago, the Logical One is Romain Gauthier‘s flagship timepiece, equipped with an unusual chain and fusee mechanism. Originally available only in precious metals, the Logical One will make its debut in titanium at Baselworld 2016, rendering it slightly more affordable.

Visually and technically identical to the precious metal Logical One, the new titanium version differs in case material and colours with the movement finished in dark grey. Two dial options are available: vitreous enamel in black or white, or a black clous de paris (hobnail) guilloche dial.

One of the oldest types of constant force mechanism, the chain and fusee has been reimagined in the Logical One. A short chain wrapped around a snail cam is the key innovation, replacing the traditional cone that uses the principle of leverage to even out the power from the mainspring.

Another novel feature of the Logical One is the button winding – pushing the button at nine o’clock winds the watch, and it takes 40 actions to fully wind the mainspring which has a 46-hour power reserve. For a more detailed explanation of the Logical One, read our in-depth coverage of the watch at its launch.

Enamel dials at left and centre, hobnail dial on the right

Pricing The titanium case is 43 mm in diameter and a substantial 15 mm in height. The Logical One in titanium costs SFr98,000 with the hobnail guilloche dial, while the enamel dial version is SFr102,000. Prices are before taxes.

Yet another addition to Tudor’s popular line of retro dive watches, the Black Bay Bronze is the first Tudor made of the fashionable metal. Larger than the ordinary Black Bay at 43 mm in diameter, the Black Bay Bronze is milled from a bronze and aluminium alloy that has a brushed finish on all surfaces. Susceptible to oxidisation that forms a protective layer on its surface, bronze will acquire a patina over time that aficionados appreciate.

To go with the bronze case, the dial and bezel are chocolate brown with gold accents. Instead of the usual baton markers at the quarters, the Black Bay Bronze features Arabic numerals, a design collectors have nicknamed the “Explorer” dial after the Rolex watch with the same look. The “snowflake” hands are another historically-inspired detail, as are the holes drilled into the sides of the lugs to make strap removable easier.

Like other bronze watches, the case back is not bronze, since the metal tends to cause allergic reactions. Instead it is stainless steel coated to resemble bronze.

Similar to the slew of Black Bay models launched at Baselworld 2016, the Black Bay Bronze is powered by the in-house MT5601, an automatic movement with a 70-hour power reserve.

Available with either a distressed leather strap or canvas NATO-style strap (both with bronze buckles), the Black Bay Bronze will retail for SFr3800.