Silver, 0.61 grams, 19.22 mm. Mule of Profile Left (BMC Type i) obverse and Bonnett (BMC Type ii) reverse types; 1068-1070 AD. Obverse: profile bust with sceptre before and PIL[ ]RE legend. Reverse: short voided cross with annulet at centre, pellet between two crescents at cross ends and pile with single pellet within each quadrant and ]ELMERON[ legend for a moneyer name ending -elmer at an uncertain mint. A moneyer named Aethelmer worked at Lincoln mint for the Bonnet type but this die does not match any listed in EMC/SCBI so this is conjectural. S. 1250/1251; N. 839/842. About fine, the obverse from a worn die. Unpublished, excessively rare (unique?). Mule coins, where coin dies of incorrect types are used together are always of great numismatic interest. They often help to provide evidence as to sequence of the types (together with information from other sources) and, as they are unauthorised or accidental, they are always very rare.