Oman ½/1/5/10 Rial ND(1977) P#16a/17a/18a/19a - UNC
ND (1977). Green and purple on multicolor underprint. Arms at right. Back: Sumail fortress. Watermark: Arms. ND (1977). Red and brown on multicolor underprint. Arms at right. Back: Rustaq Fortress. Watermark: Arms. ND (1977). Lilac and blue on multicolor underprint. Arms at right. Back: Jalali Fortress. Watermark: Arms. ND (1977). Brown and blue on multicolor underprint. Arms at right. Back: Sumail Fortress. Watermark: Arms.