 His coins bear the royal name and that of the moneyer, and in fabric are midway between the "sceattas" and the new Frankish pennies.Initially struck in fine silver, Beonna's coinage later declined in standard, though one of his moneyers survived to strike some of the earliest coins known for Offa of Mercia.It was Offa who introduced the broad penny to southumbrian England on a substantial scale, and made the employment of king's and moneyer's names standard at least three mints