Collector's tools
Authentication & Fraud Awareness
Composite, altered and misrepresented watches are common enough that recognising the patterns is a basic collecting skill. This page explains what each pattern is, why it happens, what evidence to look for, and — just as importantly — what a photograph alone cannot tell you.
Patterns
Common forms of misrepresentation
Reproductions
- What it is
- Modern objects made in the style of, or explicitly copying, an earlier design, sometimes without disclosure.
- Why it happens
- Reproductions are made for decoration, for the vintage-style market, or deliberately to deceive buyers seeking an antique.
- Evidence to look for
- Manufacturing methods inconsistent with the claimed period (laser-cut parts, modern alloys, CNC finishing marks)
- Serial or reference numbers that don't correspond to any documented production run
- Materials or fasteners not available at the claimed date
- What photographs alone cannot establish
- confirm alloy composition, tool marks under magnification, or manufacturing process — these usually require physical inspection or, for metals, laboratory analysis.
Frankenwatches
- What it is
- A watch assembled from genuine parts of different watches, sometimes different periods or even different models, presented as a single original object.
- Why it happens
- Assembling a complete-looking watch from partial, damaged donor watches is more profitable than selling incomplete parts individually.
- Evidence to look for
- Case and movement serial ranges that don't correspond to each other
- Dial feet holes that don't match the movement being used
- Finish or wear inconsistency between case, dial and movement
- Screws, hands or a crown from a visibly different production series
- What photographs alone cannot establish
- prove that every part started life together — that requires cross-referencing documented serial ranges and, ideally, an in-hand inspection by someone familiar with the reference.
Re-cased watches
- What it is
- A movement transferred out of its original case into a different case, often a more desirable one.
- Why it happens
- A rare or higher-value case commands a premium over the same movement in a plain case, creating an incentive to combine them.
- Evidence to look for
- Case size or dial-foot layout not matching the movement's original configuration
- Movement holding clips, case seat or stem length inconsistent with the case
- Case serial number ranges dating from a different period than the movement
- What photographs alone cannot establish
- measure fit tolerances or confirm the case interior matches the movement without disassembly.
Re-dialled watches
- What it is
- A watch fitted with a dial that has been repainted, refinished, or entirely replaced.
- Why it happens
- Damaged original dials are commercially unattractive, so repainting (sometimes copying the original layout, sometimes not) restores an attractive appearance.
- Evidence to look for
- Font, spacing or logo details inconsistent with documented originals
- Printing that sits too crisply or too thickly for the claimed age
- Missing maker's marks or reference numbers usually printed on the original
- UV or raking-light examination showing overpaint (requires the object in hand)
- What photographs alone cannot establish
- reveal print thickness, underlying layers, or UV fluorescence — these need physical examination under appropriate lighting.
Replacement movements, hands or parts
- What it is
- One or more components substituted for the originals, sometimes for legitimate repair reasons and sometimes to deceive.
- Why it happens
- Repairs happen; the concern is non-disclosure, not the repair itself.
- Evidence to look for
- Component finish, screw types or engraving style inconsistent with the rest of the object
- A movement grade or configuration not listed as ever fitted to that case reference
- Replacement parts that are functionally correct but visibly of a later production style
- What photographs alone cannot establish
- always distinguish a high-quality correct-style replacement from an original without comparison to verified reference examples.
Fake signatures
- What it is
- A maker's name, hallmark or logo added to an otherwise unsigned or anonymous object to imply an attribution.
- Why it happens
- A recognised maker's name can change how an object is perceived, so signatures are sometimes added to generic or unsigned work.
- Evidence to look for
- Engraving depth, font or placement inconsistent with documented genuine signatures
- Signature style that doesn't match the movement's actual construction or period
- Absence of the maker's other expected marks (case numbers, poinçons, corresponding archive records)
- What photographs alone cannot establish
- confirm engraving age or tool wear pattern — that typically needs in-hand examination and comparison against verified genuine examples.
Incorrect period combinations
- What it is
- Parts that are each genuine but come from periods that could not originally have been combined.
- Why it happens
- Assemblers may not know, or may not disclose, that a part postdates or predates the rest of the object.
- Evidence to look for
- A component style, material or feature that was not yet in use, or was already obsolete, at the claimed date
- Hallmark date letters or import marks inconsistent with the movement's production date
- What photographs alone cannot establish
- substitute for checking hallmark date tables, movement serial-number datasheets, or published production timelines.
Polished cases
- What it is
- A case that has had its surface mechanically or chemically refinished, removing metal.
- Why it happens
- Polishing removes scratches and improves apparent condition, but also removes original surface detail.
- Evidence to look for
- Softened or missing engine turning, hallmarks stamped shallow or partially erased
- Rounded-over edges and lettering that should be crisp
- Case thickness thinner than documented specification, in extreme cases
- What photographs alone cannot establish
- always reveal softened engine turning at typical listing-photo resolution; raking light and, ideally, in-hand handling are more reliable.
Over-restoration
- What it is
- Restoration work that goes beyond returning function, removing or replacing original material unnecessarily.
- Why it happens
- A refinished object often looks more immediately attractive to a casual buyer than an honestly worn original.
- Evidence to look for
- Uniform, unnaturally even finish across a component that should show honest wear
- Refinished dial, over-polished case, or replaced crystal used to mask damage rather than to conserve
- What photographs alone cannot establish
- distinguish careful conservation from cosmetic over-restoration nearly as reliably as physical inspection or a documented service history can.
Misrepresentation
- What it is
- Any description — deliberate or careless — that overstates originality, condition, rarity or attribution.
- Why it happens
- Sellers vary in expertise and incentive; not all misrepresentation is intentional fraud, but the effect on a buyer is the same.
- Evidence to look for
- Listing language that doesn't match visible evidence in the seller's own photographs
- Vague or absent provenance where specific documented history is claimed
- Reluctance to provide additional photographs of markings, numbers or the movement
- What photographs alone cannot establish
- replace asking direct questions and requesting further evidence before purchase.
Method
Research method
Before forming an opinion
- Compare against documented, verified examples of the same reference or model where they exist
- Check that case number and movement number ranges are consistent with each other and with the claimed date
- Consult published references — factory ledgers, hallmark date tables, registered trademark records, specialist society archives
- Ask the seller directly for provenance: prior ownership, purchase records, service history, and further photographs of markings
- Treat absence of evidence as inconclusive, not as proof either way
- Seek a second, independent opinion from a specialist before relying on a single assessment
Scope
This site does not authenticate objects
Nothing on this site constitutes authentication, appraisal, or a determination of authenticity for any specific object. The material here explains general patterns and research methods so that you can ask better questions and know what to look for — it cannot substitute for physical examination by a qualified specialist, and it does not offer a verdict on any watch, movement, or part you may own or be considering buying.
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