Mint Mark
Also: mintmark, coin mark, mint identifier
A mint mark is a small symbol or letter on a coin that uniquely identifies the mint that issued it.
The mint mark is a small, often inconspicuous symbol, letter or combination of letters placed on a coin to identify the mint that issued it. It is at once an essential authenticity feature and a historical record.
History and significance
The system of mint marks reaches back into antiquity. Even in 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, since numerous mints operated at the same time.
Today mint marks serve three main purposes:
- Proof of origin: the numismatist and the precious-metal investor can instantly tell which mint produced a coin.
- Quality assurance: mints of high standing – 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 edition exist in very small numbers and therefore command significant premiums over the pure intrinsic 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 (historically) |
| (no mark) | Austrian Mint (Vienna) | Austria |
The Krugerrand from South Africa's Rand Refinery does without a classic mint-mark system, since the coin is struck exclusively in Pretoria. The same applies to the Vienna Philharmonic from the Austrian Mint: it carries no separate mint mark, as Vienna is the only place of minting.
The mint mark as an indicator of authenticity
A mint mark alone does not guarantee authenticity – forgers can imitate it. It should therefore always be checked in combination with other features: weight, diameter and thickness and the authenticity check using a magnet test, density determination or X-ray fluorescence analysis.
The fineness hallmark and the hallmark punch complement the mint mark and together form the complete identification system of a coin.
In a nutshell
The mint mark is the "seal of origin" on every coin: it names the mint, supports authenticity testing and – for rare issues – can lift collector value well above the pure gold price.