Historical Zippo construction: cases, hinges, inserts and materials

Early cases were built from brass tube stock, with separate end plates joined in place.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

The taller square-corner case is typical of much of the early production period; subsequent body shapes overlap.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

A drawn body with rounded corners emerged before the wartime period, alongside earlier case forms.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Some wartime and immediate postwar cases feature an outwardly curved base; compare the complete case profile.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

A taller case form with a recessed (canned) base is documented during the immediate postwar period.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

The familiar recessed-bottom case profile develops in the postwar years; this alone cannot distinguish later decades.

Present-day cases, replicas and special lines can depart from the usual form.

Chrome-plated brass was a principal prewar case construction; the changeover into steel was gradual.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Steel cases appear during the 1941–1942 material transition before wartime black-crackle finishes became common.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Wartime steel bodies are strongly associated with black-crackle coating; some transitional or repaired examples differ.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Unplated/polished nickel-silver cases are documented in the immediate postwar period, especially early 1946 examples.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Chrome-plated nickel-silver cases appear by late 1946 and continue through 1947; the crossover is not a strict January boundary.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Chrome-plated brass bodies are documented across the late 1940s and into the early 1950s.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Chrome-plated steel bodies are documented again during the early-1950s Korean War period.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Chrome-plated brass becomes typical again in the mid-1950s; special materials and later editions are exceptions.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Early cases commonly feature a three-knuckle hinge attached to the outside of the case.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

An external four-barrel hinge is an early transitional form.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Four-barrel hinges mounted internally are typical of the later prewar and early wartime period.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Three-barrel internal hinges are widely documented from later wartime production into the 1949 changeover.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Five-barrel hinges with relatively even barrel widths appear from late 1949 onward.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Later five-barrel hinges generally have an uneven barrel-width pattern. This broad clue cannot determine a precise year.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

A narrower overall hinge dimension appears in later regular production; use measurements only as supporting evidence.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Early case bottoms commonly carry patent-pending wording before the first granted patent number.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

PAT. 2032695 is associated with many late-1930s through early-1950s bottom stamps, with layout variations.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Collectors document combinations of the second patent number and patent-pending text during the mid-1950s.

Patent number issued in 1950; the appearance of particular stamp layouts may be later.

The second patent number is frequently found on period bottom stamps alongside date marks; placement varies.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Patent numbers disappear from standard US regular-case bottom stamps around the late-1967 transition.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Early inserts are documented with tubular brass construction; check assembly methods as well as metal.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Early-1940s inserts increasingly use steel, including plated and seamed wartime constructions.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Nickel-silver inserts are documented for the immediate postwar years, including Terry Lyons’s 1946–1949 specimens.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Steel inserts reappear in the early 1950s; material and markings must be checked together.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Chrome-plated steel construction with a seam is typical of later regular inserts, but special and premium variants differ.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Some early insert constructions carry little or no stamped instruction text.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

One-sided patent/instruction layout is common in several mid-century insert families; the exact layout evolved.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Vertical inscription layouts are common across later twentieth-century inserts; compare typography and code patterns.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Two-sided marking layouts appear through later insert generations, alongside evolving date-code placements.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Very early inserts can have sixteen chimney holes and a closed wheel-side wall.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Fourteen-hole chimneys are characteristic of many prewar and immediate postwar inserts.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Sixteen holes and an open wheel-side chimney wall become typical from the late 1940s onward.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Earliest insert types use a coil-spring-based cam mechanism; other features distinguish exact variants.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

The arched/humped leaf cam spring is documented across several prewar and postwar decades.

The photographed 1947 Terry Lyons example has a modern replacement spring; never infer 1947 spring design from that component.

The straighter, narrower leaf spring becomes typical in the late 1950s and remains in use into the 1970 transition.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

A wider straight leaf spring is typical of much of the 1970s and 1980s.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Later springs show wheel-side shaping/tapering; date the insert using inscriptions and other details as well.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

The earliest flint wheels commonly show a predominantly horizontal tooth-cut pattern.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Cross-cut flint-wheel pattern becomes typical after the war, with possible overlap and replacements.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Hollow flint-wheel rivets appear through the early 1960s; later examples may carry replaced components.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Hollow and solid rivets can overlap during the early-1960s transition.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Solid rivets become typical from the mid-1960s onward.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Some early inserts were packed without a modern-style felt pad; preserved originals are important for confirmation.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Some wartime and immediate postwar examples use a long cylindrical felt/filter piece.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

A plain pale rectangular felt pad is documented across many decades; replacement pads limit its dating precision.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Red felt is documented as a less-common variant, not as a mandatory feature of every example in this interval.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

The black printed LIFT TO FILL pad without an extra hole is a useful transitional clue.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

A felt pad with black LIFT TO FILL text and a spare-flint hole is a common later version.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Red LIFT TO FILL lettering appears on many newer pads; it is not a standalone year indicator.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Older wick styles can differ from the later copper-wire-interwoven wick; repairs commonly replace wicks.

Some historic wick materials may contain asbestos; avoid disturbing uncertain old material.

Copper-wire reinforcement becomes common around 1980; wicks are consumables and cannot reliably date a case.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

Some late prewar and wartime examples use flat cellulose or cotton packing materials; survival and originality vary.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.

A consolidated cotton packing form was offered in some period inserts; this is a documented variation rather than standard for every lighter.

Typical Bradford-made regular lighter; exceptions and overlapping production runs exist.