How to date antique furniture: joinery, saw marks, screws and nails

Style tells you what a piece imitates; construction tells you when it was made. Pull out a drawer and look at the dovetails, then check the backs and bottoms for saw and plane marks, and look closely at screws and nails. When the joinery, tool marks and fasteners all agree, you have a reliable date range. When they disagree, you have found a repair, a marriage or a reproduction.

By the Antique ID team · Updated 2026-10-13

Have a piece like this? Scan it with Antique ID for an instant identification and an estimated value. App Store →

Start with the drawers

Drawers are the easiest place to read a piece of case furniture, because the joints are visible and drawers are rarely replaced. Pull one out and look at the corner where the front meets the side.

Hand-cut dovetails

Before machines, every dovetail was laid out and sawn by hand. The pins (the narrow wedges on the drawer front) are often very slim and spaced a little unevenly, and the cabinetmaker's scribe line, a fine scratched line marking the depth of the cut, is often still visible across the end of the board. Saw cuts sometimes run past the line. No two joints on the same piece are exactly identical.

The Knapp joint

Fine Woodworking's history of the joint credits Charles B. Knapp of Waterloo, Wisconsin, with an 1867 patent for a round pin set into a semicircular socket, which a machine could cut quickly. Popular Woodworking dates its use from the early 1870s to about the end of the 19th century. If you see these "pin and scallop" joints, the piece was almost certainly made in a North American factory in that window.

Machine-cut dovetails

Router-style dovetailing machines produce joints in which the pins and tails are the same width and perfectly evenly spaced, often with rounded ends. Popular Woodworking notes that machine-cut dovetails of this kind establish that a drawer is no older than about the 1890s.

Read the tool marks

Turn the piece around and look at the back boards, the drawer bottoms and the undersides of tops, the surfaces makers did not bother to finish.

• Straight, slightly irregular saw marks come from hand sawing or from an up-and-down mill saw.
• Regular arcs are left by a circular saw at a sawmill. Circular-sawn lumber is a 19th-century and later feature; the date it became common varies by region and is debated, so treat arcs as supporting evidence rather than a firm date.
• Shallow, scalloped hollows on secondary surfaces come from hand planes. Perfectly flat, uniform surfaces with fine regular ripples point to a power planer.
• Chamfered or beveled edges on drawer bottoms and panels were made so a thin edge would fit a groove; the bevel is usually hand-planed on early work.

Screws

A study by the American Institute for Conservation's Wooden Artifacts Group examined screws taken from dated American furniture. It found screws from about 1780 that were entirely hand-made, and screws from about 1795 made from drawn wire but still with hand-filed heads and slightly off-center slots. Heads kept a hand-finished look until about 1837. Early lathe-made screws had blunt ends. The study's earliest example of a true gimlet point, the sharp threaded tip modern screws have, dates from about 1845. Much later, the cross-head Phillips screw was patented in the 1930s (Henry F. Phillips's patents were issued in 1936), so a Phillips screw in an original position means the piece, or that part of it, is 20th century.

Always check whether a screw is original. Hinges and locks are often replaced; telltale signs are extra holes, filled holes, a ghost outline of earlier hardware, or bright wood inside the screw hole.

Nails

The National Park Service historian Lee H. Nelson's nail chronology, written for dating buildings, gives broad stages that also apply to furniture. Hand-wrought nails, with hammered heads and tapered square shanks, were used through the 18th century and competed with cut nails until at least 1820. Machine-cut nails, with rectangular shanks tapering on two sides, appear from the 1790s, and cut nails made after about 1830 are virtually indistinguishable from modern ones. Round wire nails were made in small sizes in the US from the 1850s; their machinery was perfected in the 1860s and 1870s, and by the late 1880s they were displacing cut nails. A round wire nail holding an original back board points to the late 19th century or later.

Shrinkage, wear and color

Wood shrinks across the grain, not along it, so a round tabletop made from solid boards becomes slightly oval over a long time, and panels shrink in their frames. Wear should appear where hands and feet actually touch: drawer runners, the fronts of chair stretchers, the edges around handles. Even, overall "distressing" is a common sign of artificial aging. Unfinished surfaces darken with age through oxidation; a freshly cut or sanded area on a supposedly old back board stands out.

Marriages, reproductions and revivals

A "marriage" combines parts of two pieces, such as the top of one bookcase on the base of another. Check that the woods, the color of the secondary timber and the construction match between parts. Revival furniture copied earlier styles throughout the 19th and 20th centuries: a "Chippendale" chest can be a 1760s original, a Victorian revival or a modern reproduction, and only construction separates them.

What drives value

Period originality matters most: original surface (finish), original hardware, untouched condition and an unbroken history add value, while refinishing, replaced parts and marriages reduce it. Maker attribution, regional style, wood quality, form and size, and current taste all play a part. For a quick read, photograph the whole piece, a drawer joint and any labels and scan them with Antique ID for an identification and an estimated value range. An estimate is not an appraisal: for important furniture, consult a qualified appraiser or a furniture specialist at an auction house.

Identify your antique in seconds

Antique ID identifies an item from a photo, reads visible maker's marks, suggests a period and gives an estimated value range, so you know whether it deserves a closer look.