Mint Mark
Also: Mintmark, Coin mark, Mint identifier
A mint mark is a small symbol or letter on a coin that uniquely identifies the issuing mint.
The mint mark is a small, often inconspicuous symbol, a letter or a combination of letters applied to a coin to identify the issuing mint. It is at once an indispensable authenticity feature and a historical record.
History and significance
The system of mint marks reaches back to antiquity. As early as the Roman Empire, individual mints marked their coins to ensure quality control and accountability. In the Middle Ages and the early modern period, marking became a legal requirement in many countries, as numerous mints operated simultaneously.
Today mint marks serve three main purposes:
- Proof of origin: The numismatist and the precious metals investor can immediately recognise which mint produced a coin.
- Quality assurance: Highly reputed mints – such as the Perth Mint, the Royal Canadian Mint or the Austrian Mint – stand for consistently high manufacturing standards.
- Collector value and rarity: Certain mint marks of an issue exist in very small numbers and therefore command considerable premiums over the pure material value.
Well-known mint marks at a glance
| Mark | Mint | Country |
|---|---|---|
| P | Perth Mint | Australia |
| W | West Point Mint | USA |
| S | San Francisco Mint | USA |
| MO | Mexico City (Casa de Moneda) | Mexico |
| (no mark) | Philadelphia Mint | USA (historical) |
| (no mark) | Austrian Mint (Vienna) | Austria |
The Krugerrand from South Africa's Rand Refinery has no classic mint-mark system, as the coin is struck exclusively in Pretoria. The same applies to the Vienna Philharmonic of the Austrian Mint: it bears no separate mint mark, as Vienna is the only minting facility.
Mint mark as an authenticity indicator
Mint marks alone do not guarantee authenticity – counterfeiters can imitate them. They should therefore always be examined together with other features: weight, diameter and thickness, as well as the authenticity check by magnet test, density measurement or X-ray fluorescence analysis.
The fineness stamp and the hallmark complement the mint mark and together form the complete identification system of a coin.
In brief
The mint mark is the "seal of origin" of every coin: it names the mint, supports the authenticity check and can – for rare mintages – raise the collector value well above the pure gold price.