How to Identify Antique Furniture: Joints, Saw Marks, Nails and Finishes

A chest of drawers in an antique style might be 250 years old or 25. The front can be misleading, because styles were copied again and again. The real evidence is usually hidden in the construction: inside the drawers, underneath, and across the back. This guide explains what to look for and how each clue helps you narrow down a date.

Before you start, take out the drawers, find a good torch, and be ready to look at the parts nobody was meant to see.

Dovetail joints

Dovetails are the interlocking joints that hold drawer fronts to drawer sides. They're one of the best dating clues.

• Hand-cut dovetails are usually few in number, with narrow "pins" between wider "tails". Spacing and angles vary slightly from joint to joint. You can often see a thin scribed line across the drawer side where the maker marked the depth of the cut, and sometimes saw cuts that run slightly past that line.
• Machine-cut dovetails are evenly spaced, identical, and often have pins and tails of about the same width. They became common in factory furniture in the late 19th century.
• Pin-and-scallop joints, sometimes called Knapp joints, use round pegs and semicircular cut-outs. They come from an early machine method used for a few decades in the late 19th century.

Very early or country furniture may use simpler joints, such as nailed drawer fronts or a single large dovetail. Some modern craftspeople still cut dovetails by hand, so hand-cut joints alone don't prove age.

Saw and tool marks

Look at the backs of cases, the undersides of tops, and drawer bottoms. These were rarely smoothed, so tool marks survive.

• Straight, slightly irregular saw marks come from hand saws or older straight-blade mills.
• Curved, arc-shaped saw marks come from a circular saw. Circular saws were in widespread use by the mid-19th century, and the marks are typical of later work.
• Hand-plane marks show as shallow, gentle ripples or scallops you can feel with your hand. Boards may also vary in thickness.
• Perfectly flat, uniform surfaces with fine, regular ridges suggest machine planing.

Nails and screws

Fasteners changed over time and are easy to check, but remember they're often replaced during repairs. Look at several, not just one.

Nails

• Hand-forged (wrought) nails have tapered square shanks and irregular, hammered heads. They were the norm before the late 18th century.
• Cut nails were cut from sheet iron and have rectangular shanks that taper on two sides. They were widely used from around the 1790s through much of the 19th century.
• Wire nails have round shanks and uniform heads, like modern nails. They became standard in the late 19th century.

Screws

• Handmade screws have uneven, shallow threads, blunt ends and slots often cut off-centre.
• Machine-made screws with pointed tips and even threads became common from the mid-19th century.
• Phillips (cross-head) screws were introduced in the 1930s. If they're holding original parts together, the piece is not an early antique.

Finishes

The finish can help date a piece, though many antiques have been refinished at some point.

• Shellac was the dominant clear finish in the 19th century. Its French polish form gives a deep, glassy shine. Shellac softens with denatured alcohol.
• Oil and wax finishes were used on many earlier and country pieces.
• Nitrocellulose lacquer came into wide factory use in the 1920s.
• Polyurethane and other modern plastic finishes became common after the mid-20th century. They look thick, uniform and slightly plastic.

If you test a finish, do it only on a hidden spot with a cotton bud, and never on a valuable piece without professional advice. An original old finish is often prized, and cleaning or refinishing can lower value.

Wood shrinkage

Wood shrinks across the grain as it dries over many decades, but barely at all along the grain. That leaves clues:

• Round tops become slightly oval. Measure a round tabletop with the grain and across it. On an old table, the measurement across the grain is often a little smaller.
• Panels shrink and leave gaps or an unfinished strip at the edge where the panel has pulled back from the frame.
• Drawer bottoms shrink and may have pulled out of their grooves or split.

New wood made to look old won't show this kind of movement.

Secondary woods

Makers used expensive woods such as mahogany, walnut or rosewood for visible surfaces, and cheaper secondary woods for drawer linings, backs and internal frames. Common secondary woods include pine, poplar and oak, with regional preferences: tulip poplar was common in American furniture, for example, and pine or oak in much British furniture. Secondary woods help identify region and can expose a "married" piece, where the drawers' secondary wood doesn't match the case.

Man-made boards are a strong signal. Plywood came into wide furniture use in the 20th century, and particleboard and MDF later still.

Hardware

Handles, escutcheons, hinges and locks give clues, but they're the parts most often replaced.

• Look inside the drawer front for extra holes or patched holes, a sign that handles were changed.
• Check for a "ghost" outline on the surface where an earlier handle of a different shape once sat.
• Hand-made hardware tends to show file marks and slight irregularities. Stamped or cast modern hardware is uniform.

Replaced hardware is common and doesn't make a piece fake. It does affect value, and original hardware is usually preferred.

Labels, stamps and marks

Many makers and retailers marked their furniture with paper labels, stencils, branded stamps or carved signatures. Look inside drawers, on the backs of cases and under seats. A genuine label can make a big difference to value, which is exactly why labels are sometimes faked or moved from one piece to another. A label should look as old and worn as the surface it's on.

A quick dating table

These dates are approximate and vary by country and region. Rural makers often kept using old methods long after factories changed.

Feature	Earlier sign	Later sign
Dovetails	Hand-cut, few, uneven, scribe lines	Machine-cut, many, identical (late 19th century onward)
Saw marks	Straight, irregular	Circular arcs (common from mid-19th century)
Surface	Hand-plane ripples, uneven thickness	Machine-planed, uniform
Nails	Hand-forged, then cut nails	Round wire nails (late 19th century onward)
Screws	Handmade, blunt, off-centre slots	Machine-made pointed (mid-19th century), Phillips (1930s onward)
Finish	Oil, wax, shellac	Nitrocellulose lacquer (1920s onward), polyurethane (mid-20th century onward)
Boards	Solid wood, shrinkage across grain	Plywood, particleboard, MDF (20th century)

Putting it all together

No single clue dates a piece on its own. What you're looking for is agreement. If the style says 1780, the dovetails, saw marks, nails, wood and wear should all fit that date too. When one clue doesn't fit, it may be a repair, a later copy, or a married piece. For more on spotting faked age, see antique, vintage or reproduction.

Tip: Photograph the front, the back, the inside of a drawer showing the dovetails, and any labels. AI Antique uses those photos to suggest a style, period and likely country of origin, with an estimated price range you can then check against recent sales.

Remember that demand for much traditional dark-wood furniture has fallen in recent decades, so age alone doesn't guarantee value. Our guide on how much your antique is worth explains how to check realistic prices. For an important piece, a furniture specialist at an auction house or an accredited appraiser can confirm the details in person.