According to an Oman News article, the Central Bank of Oman (CBO) issued a new 20-rial (US$52) commemorative banknote on 22 November 2010. The new note is legal tender and will circulate in parallel with the existing banknotes (Pick 41) of the same denomination.
The new note is the same size as the old one, and the front portrays Sultan Qaboos bin Said, the Grand Mosque, the coat of arms, and the main entrance of the CBO headquarters. The note bears the text "40th National Day" and the year of issue expressed in Arabic and English 2010 (1431 AH and 2010, respectively). The note is signed by the Sultan, who also appears as the watermark image, and the note is protected by a windowed security thread. According to the press release, "a window showing the denomination (20) in Arabic appears on the right side." Although it is difficult to tell by examining the low-resolution images currently available, this window may be an Optiks thread, indicating the note was printed by DLR.
The back of the note depicts the 40th National Day logo, 40th National day text, the Royal Opera House, and the National Emblem.