The Oman 20 Rials commemorative banknote is part of the 2010 (AH1431) issues. It is blue, olive green, and purple. in color and measures 167 x 76 mm. The obverse side shows a green SPARK feature, a crown as a registration device. the Sultan Qaboos Grand Mosque in Bausher, the coat of arms with crossed swords and khanjar (dagger), a portrait of Sultan Qaboos bin Said, and the main entrance of the CBO headquarters. The reverse side features the coat of arms, the Royal Opera House building in Muscat, the 40th National Day logo, and a crown. This banknote uses a windowed security thread with demetalized 20 RIALS and contains a watermark with a sultan and electrotype 20 design. It is also in uncircualted condition and TAP Authenticated by Banknote World experts.