Constance Belt Buckle & Reversible Leather Strap 38 mm Box 135 and Togo Calfskin So Black Metal Finish Buckle Noir Gold

There is a moment in a long evening when a reversible belt earns its keep. Collar loosened, jacket off, and what was formal at seven reads almost relaxed by midnight — this Noir and Gold Constance makes that switch with a single flip, from deep black Box calf to a warm gold tone.

Around the waist of a suit the noir face is impeccable: matte enough to disappear, rich enough to notice up close. Turned to the gold side, the same strap suddenly wants a knit polo and a quiet restaurant. Above it all sits the So Black buckle, its dark metal finish the one constant, drawing the eye to the buckle’s silhouette rather than to any sparkle.

The construction is the house’s usual pairing — Box 135 and Togo calfskin, one face smooth, one face softly grained — at 38 millimetres, which is a confident width for a man’s belt. Sizes 80 through 115 run in centimetres, so measure your actual waist rather than guessing from clothing labels; a properly sized Constance should close on its middle hole, leaving you room each way.

An honest caveat to think about: reversible straps are wonders of engineering precisely because they flex more than single-face belts, and the smooth Box face is the most sensitive layer of this design to oil, sunlight and rough handling. Wear it hard, but store it rolled and out of the light; wipe it with a dry cloth after an evening out; and accept that over years the Box will collect its share of memories. It is still the most versatile belt I own.