In Depth · Bulgari

The Bulgari Octo Finissimo 37 mm is a study in proportion

A compact titanium case only makes sense when the dial, bracelet and micro-rotor calibre follow the same idea.

Hen & Mills Editorial · 3 min read · 19 October 2026

The smallest useful thing an ultra-thin watch can do is stop looking like a thickness exercise. A flat case can be impressive on a ruler and awkward on a wrist, particularly when the bracelet and dial seem to belong to a different design. The Australian product page for Bulgari's Octo Finissimo 37 mm, reference 104351, suggests a more complete proposition. The question is whether its compact titanium case and micro-rotor movement make the geometry easier to live with, rather than merely making the numbers smaller.

Thirty-seven millimetres of Octo geometry

Bulgari gives the satin-polished titanium case a 37 mm diameter and a thickness of 6.45 mm. Those figures matter together: the first puts the faceted Octo shape in a more compact footprint, while the second keeps the profile consistent with a watch whose surfaces are meant to read as layered but slim. A round watch can hide a small change in diameter; the Octo's stepped outline makes every edge visible. The brand does not publish a lug-to-lug measure on this page, so the numbers still cannot settle how it will sit on a particular wrist.

The front is deliberately quiet. Bulgari specifies an opaline titanium dial with rhodium-plated hands and indexes, while the product photographs show that the angular case and bracelet do most of the drawing. That matters because an already busy outline would struggle under an equally busy dial. I like the restraint here, especially the small seconds, which provides a point of motion without making the face compete with the case. The dial looks like it belongs to the titanium object surrounding it, rather than being placed inside as a separate ornament.

Move around the side and the crown is titanium with a black ceramic insert. It is a small contrast on a watch otherwise committed to a single metal, and it gives the fingers a recognisable control point without turning the case flank into an accessory display. Bulgari rates the watch to 3 ATM. That puts a clear number next to the 6.45 mm profile, without inviting an assumption that the faceted case has the same water resistance as a dive watch. The appeal here lies in its proportions and finish.

The calibre has to fit the argument

The BVF100 is a manufacture automatic movement with a micro-rotor, 2.35 mm thick, running at 3 Hz with a 72-hour reserve. Bulgari lists hours, minutes and small seconds, and describes radiating Côtes de Genève and perlage on the movement. The micro-rotor matters because it permits automatic winding without stacking a full-size central rotor above the movement. It is not just a piece of movement trivia: without a sufficiently slim calibre, the exterior proportions would have to pay for the convenience of self-winding.

There is a transparent back, so the calibre's finishing is part of the watch's actual presentation rather than a hidden claim in the specifications. The official side photograph is just as revealing: the bracelet is visually continuous with the case, with broad flat links following the same hard-edged language. Bulgari specifies a satin-polished titanium bracelet and an integrated folding buckle. That integration is why the 37 mm figure should be read as part of a whole watch, not as a detached case diameter. A thin head on a bulky bracelet would be a very different proposition.

I keep coming back to the material choice. Titanium lets the grey dial, case and bracelet sit close to one another in colour, while differences in polish and angle provide separation. For some people that will be too restrained, especially at a price where more conspicuous decoration is available. To me, the quietness is the point. The 37 mm case only works as an argument if the rest of the watch respects the same scale, and the official photographs show a design that takes the instruction seriously.

Octo Finissimo 37 mm pricing and availability

Bulgari's Australian site lists reference 104351 at A$28,200 including taxes, with options to book an appointment or find it in store. The page carries no dated announcement for this reference, so its interest here is the design decision rather than a claimed launch. At that price, 3 ATM will rightly give some buyers pause. For someone drawn to the Octo's architecture, though, the useful question is how the smaller footprint, integrated titanium bracelet and 2.35 mm calibre work together. The answer is in their proportions, not in any one record-setting number.