OMAN. Oman Currency Board. 1/2 Rial Omani, ND (1973). P-9cts. Color Trial Specimen. PMG Gem Uncirculated 65 EPQ. An incredibly rare color trial specimen in a dark grey and purple color. Arms at right. Red specimen overprint at left. High grade color trial specimen. PMG currently does not list the population report for the Color Trial specimens.