Watch List notes:

Muscat & Oman, 100 Baisa - 1/2 Rial, 1970, Pick# 1a, 2a, 3a, Sultanate of Muscat & Oman, SL# A/2 765378, A/2 132547, A/2 420606, UNC

Brown on blue-green and multicolor underprint. Arms at right. Watermark: Arms.(100 Baiza)
Blue and brown on multicolor underprint. Arms at right. Back: Jalali Fortress. Watermark: Arms.(1/4 Rial)
Green and purple on multicolor underprint. Arms at right. Back: Sumail Fortress. Watermark: Arms