Authentication methods for vintage sunglasses
Our authentic vintage eyewear expertise focuses on hands-on inspection, documented hallmarks, material identification, and cross-referencing against known references. We avoid absolute language and instead show you the technical steps we take to minimize risk and validate each pair.
What we do
Each pair is carefully disassembled for professional cleaning and polishing. This allows us to examine components individually, confirm manufacturing details, and verify hallmarks that are often only visible when frames are apart.
- Disassembly: Frames, hinges, temples, nose pads, and lenses are separated for close inspection.
- Professional cleaning: Build-up is removed using appropriate solutions and tools to preserve original finishes.
- Polishing: Surfaces are restored with attention to period-correct sheen without overworking material.
Hallmark verification
We verify brand hallmarks using magnification and directional lighting, comparing against known authentic examples. This includes both sandblasted and laser-etched logos, model stamps, and typography styles across eras.
Sandblasted logos
- Surface texture: Look for micro-pitting consistent with sandblasting rather than smooth laser engraving.
- Edge softness: Authentic sandblasts often have gently feathered edges, not hard ridges.
- Depth consistency: Uniform depth across the mark without wobble or pooling.
Laser-etched logos
- Edge crispness: Clean, sharp boundaries under magnification; no overspray.
- Burn pattern: Even etch without charring or discoloration atypical for the era/material.
- Alignment: Placement aligns with factory standards for the model and production period.
Typography & stamps
- Type style: Letterform shapes, kerning, and weight matched to period-correct specimens.
- Model numbers: Format, spacing, and hyphenation verified against catalogs and archives.
- Secondary marks: Country of origin, material codes, and batch indicators documented.
Material identification
We use magnets and tactile inspection to differentiate frame materials, confirming whether components match the expected material for the model and era.
- Magnet response: Ferrous vs. non-ferrous reaction to assess hinge pins, screws, and internal cores.
- Tactile cues: Weight, temperature feel, and flex patterns consistent with acetate, nylon, or metals.
- Finish & patina: Aging behavior appropriate to the specific material and coating used.
Age patterns & wear signatures
Authentic vintage pieces exhibit specific age patterns. We note features like verdigris on copper alloys, lacquer degradation, and period-consistent wear in contact points.
- Verdigris: Green patina typical of brass or copper components in hinges or decorative elements.
- Acetate aging: Subtle wave, oxidation, or color shift consistent with vintage cellulose acetate.
- Screw wear: Tooling marks and slot integrity suggest original assembly vs. recent tampering.
- Contact wear: Nose pad clouding, temple-tip micro-scuffs, and bridge polish commensurate with age.
Cross-referencing & documentation
We compare each pair against trusted references to validate models, configurations, and hallmark details.
- Model numbers: Checked against catalogs, dealer sheets, and known authentic listings.
- Type styles: Typography compared to period specimens for weight, spacing, and alignment.
- Component mapping: Temple length, lens shape, bridge width, and hinge style aligned with model specs.
- Production era cues: Country stamps, packaging variations, and accessory inclusions matched to timeframe.
Original lenses and cases
Where noted in product descriptions, we verify whether lenses and cases are original to the model and era.
- Lens verification: Logo etching, edge codes, and tint behavior assessed under light and magnification.
- Case verification: Stitching patterns, clasp style, logo placement, and interior lining consistent with period.
- Matching criteria: Components must align with documented specifications for the stated configuration.
If replacements are present, they will be disclosed in the product description with clear notes on fit and quality.
Our multi-point inspection
- Intake & photos: Baseline documentation before any work begins.
- Careful disassembly: Components separated for access to hidden hallmarks and wear points.
- Cleaning & polishing: Professional restoration of luster without compromising originality.
- Hallmark checks: Sandblasted and laser-etched logos, stamps, and typographic analysis.
- Material tests: Magnet response, weight, and tactile inspection for material confirmation.
- Age assessment: Verdigris and patina review aligned with expected era-specific aging.
- Cross-referencing: Model numbers, component specs, and references validated.
- Lenses & cases: Originality verified where noted; replacements disclosed if present.
- Final documentation: Post-process photos and notes added to the listing.
Transparency and limits of assessment
Authentication is a technical assessment based on observable evidence and documented references. While this process is designed to minimize risk and identify inconsistencies, it should be understood as a rigorous, good-faith evaluation—not an absolute guarantee.
- Scope: Conclusions rely on physical inspection and available references at the time of assessment.
- Disclosure: Any deviations, restorations, or replacements are noted in product descriptions.
- Updates: If new reference information emerges, listings may be updated to reflect improved accuracy.
Frequently asked questions
Do you guarantee authenticity?
No. We provide a thorough, technical assessment based on physical evidence and references. The language here is intentionally precise and avoids guarantees.
Can I see the inspection details?
Yes. Listings include notes on hallmarks, material observations, and any findings about lenses, cases, or component originality.
Are items restored?
Items are professionally cleaned and polished. Any restoration beyond cleaning will be disclosed explicitly in the listing.
What if I have doubts later?
Reach out with your questions. We’ll review the documentation and evidence with you and share any additional photos or references.
Ask about a specific pair
If you’d like deeper details—alternate angles, hallmark close-ups, or reference comparisons—send a note and we’ll provide additional documentation.
Contact us