Antique Furniture Locks and Keys Explained
Furniture locks can reveal function, quality and alteration through case construction, bolt form, wards, springs, keyhole position and fixing pattern. Keys are frequently replaced.
Examine evidence in context
No single colour, mark, joint or surface proves age. Begin with form and function, then compare materials, construction, manufacturing traces, wear, repairs and provenance. Use securely dated museum objects and primary documents as comparators; repeated auction descriptions are useful leads, not independent proof.
What to inspect
- Compare lock position with escutcheon, veneer shadow and drawer or door alignment.
- Look for redundant holes, enlarged recesses and substituted screws.
- Inspect from inside without forcing a seized mechanism.
- Record maker stamps exactly and retain associated keys separately labelled.
Work in diffuse light and raking light with a hand lens. Photograph the whole object, underside, back and close details with a scale. Record observations before interpreting them. Never scrape a coating, expose fresh wood, polish metal, enlarge a loss or apply destructive spot tests for identification.
Build a date range
Separate the earliest possible date from the most likely production period. Technologies and workshop methods overlap, while older materials were reused and later repairs introduced new evidence. Cross-check at least three independent groups of evidence: design, materials, construction, surface, marks and documented ownership.
A genuine mark supports only what it actually marks. Labels can be transferred; hardware can be replaced; a drawer can move between carcasses. Ask whether wear, oxidation and shrinkage continue coherently across each connection.
Alterations, restoration and reproductions
Search for redundant holes, ghost outlines, different timber, changed rebates, interrupted finish and inconsistent tool marks. A later replacement may be honest and old, but it changes attribution. Revivals often copy visible style accurately while concealed construction, standardised parts or later coatings reveal their manufacturing context.
Describe evidence without forcing certainty. “Probably late nineteenth century with replaced fittings” is more useful than an unsupported exact date.
Condition and care
Map cracks, lifting, corrosion, abrasion, losses and repairs before treatment. Stable age is not the same as active deterioration. Fresh frass, spreading powder, new cracks, flaking decoration or movement require isolation or professional advice.
Dust only sound surfaces with a soft brush toward a screened low-suction vacuum. Avoid household polish, silicone, metal dips, steam, abrasive compounds and undocumented coatings. Keep objects away from direct sun, radiators, damp walls and abrupt humidity changes.
When to seek specialist help
Use an accredited conservator or relevant specialist for important maker-marked objects, regulated materials, unstable paint or gilding, structural furniture damage, complex metal corrosion, porcelain restoration or any examination requiring solvents, dismantling or sampling.
Sources and further research
- [Victoria and Albert Museum collections](https://www.vam.ac.uk/collections)
- [British Museum collection research](https://www.britishmuseum.org/collection)
- [Canadian Conservation Institute Notes](https://www.canada.ca/en/conservation-institute/services/conservation-preservation-publications/canadian-conservation-institute-notes.html)
- [Getty decorative arts conservation](https://www.getty.edu/museum/decorative-arts-and-sculpture-conservation/)