George III Pattern Gold Third-Guinea Coin

George III gold third-guinea coins (1797–1813) typically sell for between £320 and £650+, depending on condition and date. Common dates in EF (Extremely Fine) condition, such as 1801, can fetch around £560-£775. Rare or high-grade “pattern” (trial) versions can command significantly higher prices at specialist auctions.
Recent Sold/Listed Prices for George III Third-Guineas:
1801 Third Guinea (Mid-grade): ~£562.50
1799 Third Guinea: ~£400–£450
1806 Third Guinea: ~£625
1810 Third Guinea: From £593
1803 (MS63 NGC): ~£865 (March 2026 data)
Key Factors Influencing Value:
Grade (Condition): Coins with “nice detail” and minimal damage sell on the higher end.
Pattern vs. Circulation: Regular issues are common, but pattern pieces (often featuring different portraits or reverse designs) are rarer.
Gold Content: They contain 22-carat gold (approx. 2.78 grams), giving them a high intrinsic metal value.

Specific and detailed mintage figures for George III pattern gold third-guinea coins are not officially recorded, as is common with many pattern (experimental or test) issues of that era. However, the circulation third-guineas, which this denomination represents, were produced in significant numbers to alleviate gold shortages, with a total authorisation of £315,000 worth of such coins in October 1797.