Some regions enforced controls that required registered stamps or inspector marks. Study directories and municipal archives for lists of authorized workshops. Workshop systems often used numeric sequences echoed on drawers and panels. Correlate repeated digits with internal construction patterns. When several pieces share font, depth, and location habits, attribution shifts from hopeful guesswork to durable, testable probability.
Patent numbers on hardware or tags anchor a not-before date. Exhibition stickers from world fairs narrow ranges further and imply prestige distribution networks. Retailers sometimes replaced maker labels with their own, but traces remain under edges. Layered evidence—patent marks, dealer decals, and shipping stencils—often compresses decades into years, exposing production windows invisible through style alone.
Hardware evolves. Hand-forged nails and early screws with off-center slots suggest earlier manufacture than machine-cut counterparts. Hinge types, brass alloys, and caster forms match catalogs issued in specific periods. Beware swapped parts; screw shadows and old holes tell truths. Photograph removed hardware on scale grids to cross-reference catalogs, patents, and surviving workshop order books efficiently.
Genuine age settles unevenly. Dirt accumulates in protected recesses, not on proud edges alone. Brands mellow into wood; paper embrittles and curls at corners. Artificial aging often repeats patterns and places perfect stories where chaos should reign. Magnification, ultraviolet inspection, and solvent-smell awareness quickly separate staged spectacle from the slow poetry of authentic, lived time.
Furniture travels and changes. A top may be replaced, drawer fronts swapped, backs reset. When marks contradict construction, follow the screw holes and saw kerfs. Married pieces can still be wonderful, but honesty matters for scholarship and value. Map discrepancies in diagrams, label photos consistently, and describe what moved, when likely, and why plausibly it happened.
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