A frame is held together by a single piece of metal you almost never see. Two or three millimetres of brass or steel, riveted into the acetate where the temple meets the rim. This is the hinge, and on its quality rests every other quality of the eyewear.
In brief
- The hinge is the part that decides how a frame ages; most modern hinges are stamped, spring-loaded and tire within two years.
- OBE of Pforzheim, Germany, founded in 1898, is one of the last European workshops that hand-rivets eyewear hinges.
- Each joint is bedded into the acetate with a flame, peened by hand on a small anvil, then polished.
- Berenford's OBE hinges are rated for over forty thousand open-close cycles, roughly three openings a day for forty years.
- Every Berenford carries a two-year guarantee on the hinge specifically.
Most modern hinges are spring-loaded, mass-stamped, and assembled by machine. They feel modern, they snap closed, and they fail in eighteen months. The pin loosens, the spring tires, and the temples no longer hold the geometry the frame was cut for.
What makes the OBE workshop different?
In Pforzheim, in the south-west of Germany, there is a workshop founded in 1898 called OBE. It is one of the last factories in Europe that hand-rivets eyewear hinges. The technique has not changed materially in a hundred years. Each hinge is bedded into the acetate with a flame, then peened by hand on a small anvil. The rivet is mushroomed flat, then polished. It takes a craftsman a minute per joint, and the joint will outlast the wearer.
A hand-riveted hinge has no spring inside. The acetate itself, warmed by hand to the face, does the work of memory. The frame closes with the slow weight of a leatherbound book, never the click of a plastic clamshell.
Why does the hinge matter every morning?
Sunglasses live a hard life. They are folded shut and pushed into bags. They are opened with one hand while a barista is asked for the second cortado. They are dropped onto restaurant tables, slipped onto the head, slipped onto the collar. A weak hinge betrays a frame inside a season. A great hinge becomes invisible, which is the highest praise an object of daily use can earn.
The OBE hinge on every Berenford frame is rated for over forty thousand open-close cycles before any measurable wear. That is, in practical terms, three openings a day for forty years, before the action even begins to feel different.
The numbered guarantee
Every Berenford is numbered, limited to a hundred pieces per model, and comes with a two-year guarantee on the hinge specifically. We do this because we know the hinge is what dates a frame in the way it ages: a sagging temple, a loose action, a tired closure. With OBE inside, that conversation does not begin for decades.
A small German story inside an Italian frame
It is not the most photogenic detail. You will never see it in an editorial. But every Berenford frame carries two centuries of craft inside its temples: 175 years of Mazzucchelli acetate from Castiglione Olona, and 127 years of OBE hinging from Pforzheim. The frame you wear at lunch in Saint-Tropez carries both, quietly.
For an example of the smaller frames where the OBE hinge feels most precise, see the Sofia Portofino or the Françoise Blue Paris. The hinge is the same on every model. It is just easier to feel on the slim cat-eye temples.
The Editor, Berenford