Double-die (doubled die) Coin Errors

In brief Die hubbing error producing a doubled image of the design or letters. Typical UK value range: £25 to £300 typical range; major doubled dies on key dates (e.g. doubled-date 1933 penny) would be six-figure rarities.

What is a double-die (doubled die) error?

A double-die — properly called a doubled die — is created when the working die is hubbed twice from the master, with slight misalignment between the two impressions. Every coin struck from that doubled die shows the same doubling pattern. Doubled dies are different from machine doubling (a strike-time artefact) — true doubled dies have rounded, separated, often shadow-like doubling, while machine doubling is flat and shelved.

How to spot one

Look at letters and numbers under 10x magnification — doubled die shows two distinct, slightly offset impressions.
Doubling on the date is the highest-value example — known as a "doubled date".
Check that the doubling is rounded and 3D, not flat. Flat shelved doubling is machine doubling, which carries no premium.
A true doubled die affects every coin from that die pair — look up known UK doubled-die varieties before claiming a discovery.

Authentication

Authenticate by sending to PCGS, NGC or CGS UK for variety attribution. They maintain reference databases of known doubled dies.

Famous UK examples

1983 doubled die 2p

£25-£90

Doubled "TWO PENCE" reverse legend on some 1983 strikes.

Various Victorian penny doubled dates

£40-£300

Numerous catalogued varieties for 1860, 1862, 1863 pennies.

Key-date UK coins worth examining

Errors on key-date coins compound rarity — the host coin is already scarce, and the error multiplies the value. Browse the rarest UK coins in our catalogue:

All UK coin error types

Mule Off-centre strike Double-die (doubled die) Brockage Lamination error Clipped planchet Wrong planchet (off-metal) Die crack Die cud (cud break) Rotated die / die rotation Broadstruck Missing edge inscription Filled die