The 1651 Commonwealth Pattern Half-Crown is a pattern from the Commonwealth period, when England had no monarch. The coin is associated with the milled experiments of Pierre Blondeau.
Identification
Numismatic references describe a silver pattern half-crown dated 1651, with a recorded weight of about 15.08 grams. Pattern coins require careful attribution because later copies and misidentified pieces can appear in the market.
Value
This is a specialist item, and value depends on authenticity, attribution, condition and provenance. Use specialist auction records and compare completed sales of the same pattern. Avoid relying on an isolated asking price.
See the British crown value guide for general terminology.