Oliver Cromwell. AV Broad, or 20 shillings, milled pattern. Dies engraved by Thomas Simon. Blondeau's, London mint. Dated 1656. 

OLIVAR•D•G•R P• ANG•SCO•ET•HIB &C PRO•, laureate head left.
•PAX•QVÆRITVR•BELLO•16-56, crowned coat-of-arms of the Protectorate: quartered arms of England, Scotland, and Ireland; central escutcheon with lion rampant left. 

North 2744; Seaby 3225; Friedberg 273.

Courtesy Ira & Larry Goldberg Auctioneers, Beverly Hills, CA. www.goldbergcoins.com
Sale 31: The Pre-Long Beach Auction May 30 - June 1, 2005, Lot 2176