Designer Date Code & Serial Number Calculators
Lost Designer reference library
Designer Date Code & Serial Number Calculators
Free reference tools for estimating production years and decoding date stamps from Hermès, Chanel, Louis Vuitton and Rolex.
Four calculators · Clear limitations · Mobile friendly
Choose a designer calculator
What these tools can tell you
Designer date codes and serial systems can reveal useful production information, but each brand uses a different method. Our calculators apply the correct historical rules for the selected brand and clearly explain when the result is exact, approximate, ambiguous or unavailable.
Open the calculator designed for that brand’s specific coding system.
Use the stamp, sticker or case serial found on the item itself.
Compare the estimate with the item’s model, materials and provenance.
Hermès date-stamp chart
Prefer a visual reference? Our complete Hermès Date Stamp Guide for 1945–2026 shows plain letters, circled stamps, squared stamps and the modern sequence. A high-resolution saveable image is included for phone users.
Why some modern codes cannot be decoded
Chanel’s newer alphanumeric metal plates, Louis Vuitton’s embedded chip system and Rolex’s randomized modern serial numbers are not public year codes. The relevant calculator will identify these formats and explain the next best source rather than generating an unreliable date.
Designer code calculator FAQs
Can a serial number prove a designer item is authentic?
No. These calculators estimate production details only. Authentication requires the complete item, its construction and provenance to be assessed.
Are the calculators free?
Yes. The four date-code and serial-number tools are free to use and require no account.
Why do some calculators return a date range?
Brands often used series across overlapping production periods, and most did not publish exact public tables.
