Definitive Stamp

A definitive stamp is a standard-issue stamp produced for everyday postal use, available at post office counters on an ongoing basis. Unlike commemorative stamps, which celebrate specific events and are typically sold for a limited time, definitives are the workhorses of any postal system: they are printed in very large quantities, issued in a wide range of denominations to meet every postage rate, and remain on sale until postal rates change or the design is updated. A defining feature of most definitive series is visual consistency — the same basic design is maintained across the full range of values.

How Definitives Differ from Commemoratives

The distinction is practical as much as aesthetic. Definitives are:

• Long-running: a definitive series may remain in production for decades with only minor modifications
• High-volume: print runs for definitives dwarf those of commemorative issues by orders of magnitude
• Multi-denomination: a definitive series covers every current postage rate from the cheapest letter inland to the most expensive international parcel
• Updated incrementally: when postal rates change, new denominations are added to the existing series rather than a new design being commissioned

Commemoratives, by contrast, are printed once (or a small number of times), withdrawn after a defined period, and typically produced in a single denomination or a small range.

Famous Definitive Series

The GB Machin heads series is one of the world’s most celebrated definitives. Introduced in 1967 with Arnold Machin’s plaster portrait of Queen Elizabeth II, the Machin design has been printed continuously in hundreds of different combinations of colour, denomination, paper, phosphor, gum, and perforation. Specialists who collect Machin varieties alone can fill multiple volumes; the Stanley Gibbons Specialised catalogue devotes an entire volume to British definitives of the Machin era.

The US Flag definitives have been reissued repeatedly since 1968, with subtle changes to the flag design, denomination, perforation, and printing method creating an extensive range of varieties. The US also issues coil versions (for vending machines) and booklet pane versions of each definitive design, each of which may differ in paper, gum, or gauge.

Germany’s Brandenburg Gate series and various Federal Eagle definitives are long-running examples from continental Europe. The Netherlands’ “Queen” series, Canada’s “Caricature” and “Leaf” definitives, and Australia’s “Flower” and “Bird” series are all major collecting areas.

Coil and Booklet Versions

Most modern definitive issues appear in at least three formats: sheet stamps (from flat sheets of 50 or 100), coil stamps (from rolls for use in vending machines — see coil stamp), and booklet pane stamps (sold in small booklets for convenience). These different formats often have different gums, different perforations, different paper, or even slightly different designs. A specialist collector will want examples of all formats and will use a perforation gauge and watermark detector to distinguish them.

Why Definitives Produce the Most Varieties

Because definitives are printed over long periods on different contracts, from different paper batches, using machinery that is adjusted and repaired over time, they accumulate varieties far more readily than commemoratives. Shade varieties, perforation varieties, phosphor band configurations, gum types, paper fluorescence — all of these can differ between printings of what is nominally the same stamp. Specialist definitive collectors often focus on a single country’s definitive series and develop deep expertise in distinguishing and valuing these varieties.

The overprint of definitives for use in territories, official departments, or provisional purposes adds another collecting dimension. Many of the world’s most valuable stamp varieties are definitives with surcharges or overprints rather than commemorative issues.