OMAN. Sultanate of Muscat and Oman. 5 Rials Saidi, ND (1970). P-5cts. Color Trial Specimen. PMG Choice Uncirculated 64. Similar to its issued counterpart in terms of color, this "Color Trial Specimen" utilizes a brighter shade of red compared to its issued counterpart, a vignette of the Nizwa Fort assumes a commanding position on the back.