On the second floor of a Sheffield building that has housed silversmiths since 1873, Donal Vesey-Marsh keeps a small brass loupe on a length of black silk ribbon hung from a hook beside his bench. The loupe is a ten-power Bausch and Lomb, made in Rochester, New York, some time between 1968 and 1972. He bought it new in 1984 for forty-two pounds, which was a week's wages at the time.
He has not used another loupe since.
The jeweller's loupe is the smallest precision instrument in the restorer's toolkit, and arguably the most important. It is, for the working day of a silver specialist, in nearly constant use. Hallmarks are read through it. Soldered repairs are diagnosed through it. The fineness of an engraver's line, the depth of a chase, the type of polish residue in the corners of an applied moulding — all are seen through a ten-power lens or they are not seen at all.
There is a small mythology around the loupe in the antique trade. Beginners suspect that a higher magnification must be better and buy twenty-power lenses, which are useless for anything but examining individual gemstones. Mid-career dealers settle on ten-power as the working standard. The old hands carry the loupe they were given by their teacher and would not change it for the world.
Vesey-Marsh's loupe is held in the right hand, the lens about an inch from the eye, and the object to be examined held in the left hand at the lens's focal distance, which for a ten-power is about twenty-five millimetres. The body leans forward slightly. The non-looking eye is kept open, against the impulse of the beginner to close it. The working eye does the looking. The other eye does nothing in particular, and that is the trick.
Closing the non-looking eye produces, after about a minute, a small headache. Keeping both eyes open produces no headache but requires a slight discipline of attention. Most people learn to do it within a week.
What the loupe shows, on a silver piece, is a small universe. The hallmark, which to the unaided eye is a series of small stamped impressions, reveals itself as four or five distinct images: the lion passant of the sterling guarantee, the town mark of the assay office, the date letter that places the piece within a year, the maker's mark of the silversmith. Each is struck at a slightly different depth. Each shows the wear of two or three centuries.
On a recent piece, an early-nineteenth-century English teapot brought in by a London dealer for examination, Vesey-Marsh's loupe revealed within forty seconds that the hallmark, while genuine, had been let into the base of the pot from another piece. The seam was invisible to the unaided eye. Under ten-power it was as clear as a soldered repair on a watch case.
This is the daily work of the loupe in a silver specialist's hands. It catches the things that are wrong. A hand-engraved monogram added in 1890 to a piece made in 1780. A foot that has been replaced. A spout that has been re-soldered. The base that does not match the body. A complete forgery, of which Vesey-Marsh has seen perhaps thirty in his career, all of them caught by the loupe within minutes.
The loupe does not catch everything. A skilled faker can produce work that holds up under ten-power, and the most expensive forgeries on the international market are designed to do exactly that. For those, a stereo microscope at twenty or forty power is needed, and the museum's metallurgical analysis if doubt remains. But the routine work — the everyday separation of the genuine from the doctored, the original from the altered, the period from the reproduction — happens at ten power, through a brass loupe held in the right hand.
The Bausch and Lomb that Vesey-Marsh has used for forty-one years is no longer manufactured. The American firm discontinued the model in the late 1990s and the trade has not produced an equivalent. The current standard is a German Eschenbach or a Belomo from Belarus, both of which are excellent. Vesey-Marsh has examined both and found them slightly better than his old Bausch and Lomb in optical quality and slightly worse in handling.
The handling matters. A loupe is held against the face for hours a day, and a poorly-balanced or rough-edged instrument becomes a small misery. The old Bausch and Lomb is balanced, smooth, and fits his hand the way a fountain pen fits a writer's. The newer instruments do not, though they may to someone who started with them.
He has trained, over the years, perhaps a dozen apprentices and journeymen who passed through the workshop. He insists, with each of them, on a single instrument used consistently. Switching between loupes produces a small but real degradation of working speed, because each instrument has its own focal length and its own small distortions, which the eye learns and then has to relearn.
His advice to anyone beginning serious work with silver, pewter, or any small antique object, is to buy a single ten-power loupe from one of the reputable European makers and use it daily for a year. After a year the eye knows what it is seeing. Before then it does not, no matter how good the lens.
The loupe is not, by itself, a substitute for any other knowledge. It does not tell the user what is being looked at. It only shows the looking. The interpretation — the recognition that this hallmark is wrong for this town in this year, that this seam is recent solder rather than period solder, that this monogram has been added — is the work of experience and reading and the slow accumulation of comparable examples.
What the loupe does, irreplaceably, is show the surface in sufficient detail that the experience has something to work with. The eye, even a trained eye, sees only so much at arm's length. At twenty-five millimetres with a ten-power lens, the eye sees what is there.
Vesey-Marsh's loupe is showing its age. The brass has darkened to a soft chocolate. The silk ribbon, which he replaces every few years, is on its eighth or ninth length. The lens itself, miraculously, has no scratches. He cleans it with a square of cotton flannel and a drop of distilled water, perhaps once a month.
He has been asked, more than once, what will happen to the loupe when he retires. He has not yet decided. The current candidate is the daughter of an Edinburgh silversmith who served part of her apprenticeship in his workshop in 2018 and 2019. She has the eye, he says, and she is patient, and she does not yet have a loupe she has used for forty years.
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