How to Date Antique Furniture: Dovetails, Screws, and Joinery

Before you take a dealer's word for how old a piece of furniture is, pull out a drawer and flip it over. The corners where the sides meet the front — the joinery — tell you more than most price tags do, and it takes about five minutes to learn to read.

Dovetail joints: the single most useful clue

A dovetail joint locks two pieces of wood together with interlocking, fan-shaped "pins" and "tails" — no nails, no screws, just geometry and glue. Look at the corner of a drawer where the sides meet the front, and you're looking at one.

The rule of thumb everyone repeats — "irregular hand-cut dovetails mean pre-1860, perfectly uniform ones mean later" — is directionally right but oversimplified. Here's the more accurate timeline:

• Irregular, slightly uneven pins and tails — cut by hand, standard through the mid-1800s, and still used by high-end cabinetmakers well into the 1900s.
• A distinctive scalloped, rounded joint (not a true pointed dovetail) — this is the Knapp joint, from the first dovetailing machine patented in 1867. Seeing one reliably dates a piece to roughly 1870–1900.
• Perfectly uniform, machine-cut dovetails — factory production, generally after 1890, and near-universal by the early 1900s.

Treat this as one data point, not a verdict on its own — some fakers deliberately hand-cut crude-looking joints specifically because they know buyers are looking for them.

Screws can date a repair, not always the whole piece

Screw type is a genuinely useful check, with one important caveat: it usually tells you when a specific screw was installed, not necessarily when the whole piece was built — old furniture gets re-screwed and repaired constantly.

A Phillips-head screw (the cross-shaped slot) is a reliable marker: the design wasn't patented until 1932 and didn't see real commercial use until 1933, with mass adoption starting around 1936. If you find one on a piece a dealer says is 18th-century, that's not proof the whole piece is fake — but it does mean that specific hardware was added or replaced well after the fact. Ask what else has been touched.

What the wood itself can tell you

Genuinely old, hand-planed surfaces are rarely perfectly flat — you can often feel faint undulations running across a tabletop or drawer front that a machine-planed surface won't have. Saw marks matter too: straight, parallel marks suggest an early hand or up-and-down saw; consistent circular arcs mean a circular saw, which didn't see wide furniture-shop use until the mid-1800s onward.

Putting it together

None of these checks work in isolation — that's the actual skill. A hand-cut dovetail on a piece with a Phillips screw tells you the joinery is old but something was repaired recently. A uniform machine dovetail paired with a claim of "18th-century" is a real red flag worth asking hard questions about. The dealers who rarely get fooled are stacking two or three of these signals, not betting everything on one. For the broader authentication picture — patina, wear patterns, and the tests that are weaker than people assume — see our guide to spotting fakes and reproductions.

A note on this post: these are general furniture-dating principles, cross-checked against woodworking and conservation sources (Popular Woodworking, Fine Woodworking) rather than Brimfield-specific reporting — they apply to any antique furniture, not just what you'll find at this show.