The 1691 William and Mary Crown is a silver crown from the joint reign of William III and Mary II. It is a historic pre-decimal coin, not a modern £5 piece.
Identification
Reference descriptions list the 1691 to 1692 type as a milled silver crown of about 30.1 grams and 38.6 millimetres in diameter. Check the date, portraits, legends and edge before deciding which variety you have.
Value
Condition, authenticity, variety and provenance can make a substantial difference. Compare recent completed sales of the same variety and grade. A dealer listing or asking price is not a completed sale.
See our British crown value guide for the general method.