How do I identify an old coin I found?
Verdict summary
Look for the country, denomination, date and mint mark, then match the design in a coin catalogue. If the date is worn, the portrait, legend lettering, size and metal narrow it down. Free references include Numista and, for British finds, the Portable Antiquities Scheme database.
Photograph both sides in daylight with a scale. Ancient and medieval coins are identified by the ruler's portrait and inscription rather than a date.
PinPoint Treasure's find identifier reads a photo and tells you how sure it is and what to check next.
Sources: Numista catalogue; Portable Antiquities Scheme finds database; PCGS CoinFacts.
Should I clean coins I found metal detecting? Not old or possibly valuable coins: cleaning, rubbing or chemicals destroy the surface and can wipe out most of a coin's value. Rinse loose dirt off with plain water at most and identify it first. Modern everyday coins can be washed with mild soap and water.
How do I know if my find is worth anything? Identify it first: value depends on exactly what it is, its date, condition and rarity. Gold and silver items are worth at least their metal content. For coins and jewellery a reputable dealer or auction house can value them; archaeological finds can be recorded by a museum or finds liaison officer.
Primary sources cited
- Numista catalogue
- Portable Antiquities Scheme finds database
- PCGS CoinFacts