1990 error 20p coin struck on a bronze 1p blank with a lette...

Hammer

£200

1990 error 20p coin struck on a bronze 1p blank with a letter confirming error from The Royal Mint. Obverse: Raphael Maklouf's portrait of Queen Elizabeth II facing right with the legend around that reads 'ELIZABETH II' above with 'D · G · REG · F · D' below. Reverse: crowned Tudor rose dividing date (1990) with 'TWENTY PENCE' around and '20' below. Composition: 977 copper (tested with countertop XRF analyser). Weight: 3.56g. Diameter: 21.4mm.This fascinating lot is offered with a signed letter from the Information and Research Manager at The Royal Mint Museum which confirms the details of this unusual error coin as follows:'The piece is of the incorrect composition for a twenty pence piece, underweight, and features slightly rounded edges consistent with the blank being unsuitable in size for the collar in which it was struck. It appears in this instance that a bronze blank, most likely intended for a 1p piece, has been struck between 20p dies.'