Modern date codes
From 2001 onward, A through L identify January through December and the two digits identify the year. For example, D 24 corresponds to April 2024.
Interactive collector tool
Date Your Zippo.
Use the markings on the bottom of the case - and, when necessary, the insert - to identify when your Zippo was made.
Built for beginners and collectors.
You do not need to know what the symbols mean. The assistant will guide you one step at a time.
Bottom stamp & insert assistant
What are you looking at?
Step 1
Collector guide
How Zippo dating works
The bottom stamp changed repeatedly over Zippo history. Modern lighters use a month letter and two-digit year, while older lighters can use Roman numerals, dots, bars, forward slashes, backslashes, patent markings or special replica stamps.
Vintage symbol codes
Regular lighters used dots, bars, forward slashes and backslashes in successive periods. The number and side of the marks matter, including a known 1979 slash variation.
Slim lighters
Slim lighters use a different dot sequence in the late 1950s and early 1960s. The assistant asks whether the case is Slim whenever that distinction matters.
Early bottom stamps
Before the standard date-code era, the overall stamp design, Zippo logo, patent information and insert style are used together to estimate a production period.
Replicas & special stamps
A 1932, 1933 or 1941 Replica stamp can identify the replica family without necessarily giving the exact production date. In these cases the insert can be the more useful dating clue.
Niagara Falls, Canada
Canadian Zippos were produced in Niagara Falls from 1949 to 2002. Canadian cases before 1987 do not use the regular production date code, while later Canadian production uses month/year codes.
Collector analysis
When a basic result is not enough, optional advanced clues such as patent wording, hinge construction and transitional stamp layouts can narrow difficult periods without forcing beginners into technical questions.
Advanced insert detective
Chimney holes, cam springs, rivets, felt, insert ribs and other construction details can support a date range. These clues are weighted as supporting evidence and are not treated as exact dates by themselves.
Historical Zippo reference archive
Explore dated bottom stamps, real photographed inserts, manufacturing developments, wartime examples, replica variants and original source credits.
Dating is not authentication.
A matching stamp does not by itself prove that a lighter is genuine. Weak strikes, replacement inserts, transitional parts and special stamps can occur. The assistant flags impossible or contradictory combinations but does not label a lighter counterfeit from one clue alone.
Sources & further reading
This independent collector tool combines real photographed examples from In Quiet Detail and contributor Terry Lyons with the In Quiet Detail reference archive and independent technical history research by Hardi Döhler. The material ranges are supporting evidence rather than guaranteed manufacturing dates. Where multiple sources describe the same physical stamp or insert type, the tool stores one reference and attaches multiple sources rather than creating duplicate entries.
Tool version 1.5 · Dating database 1.5 · Last updated: 28 Oct 2026 · Real photographed references are enhanced conservatively for readability; stamp markings are never reconstructed.