Dating Furniture by Joints, Saw Marks & Hardware

Labels lie, finishes get redone, but joinery is honest. Pull out a drawer and the construction will tell you within a few decades when a piece was built.

The dovetail timeline

Hand-cut dovetails (irregular spacing, thin pins, scribe lines): generally pre-1870s. Knapp joints (round “pin and cove” — looks like half-moons and dowels): a tight window, roughly 1870–1900, and a wonderful instant date. Uniform machine dovetails: 1890s onward. Staples, glue blocks, and cam-lock fittings: 20th century, later the cruder.

Saw marks and surfaces

Look at unfinished backs and drawer bottoms. Straight, parallel saw marks suggest pit or sash sawing (early 1800s and before). Arc-shaped circular saw marks mean after ~1850 in most American work. Hand-planed surfaces feel subtly scalloped; machine-planed feels dead flat.

Hardware as a timestamp

Nails: hand-forged rosehead (1700s), square-cut (1800s), round wire nails (post-1890). Screws: pre-1850 screws have off-center slots and irregular threads; perfectly machined screws are later — and Phillips heads in a “Danish 1955” piece mean repair or reproduction. Original hardware leaves ghost outlines; extra holes mean replaced pulls.

Materials close the case

Plywood in structural parts says 20th century; particleboard says post-1960s. Solid-wood drawer sides with oxidized, dry, dusty interiors are what a century actually smells like. Mid-century pieces legitimately use dowels and veneer over solid cores — that’s period-correct, not cheap.