Postage stamps and postal history of Muscat and Oman
This is a survey of the postage stamps and postal history of Muscat and Oman, including the present day Sultanate of Oman. == First post offices == The first post office to open in the region was at Muscat on 1 May 1864.
Source: Wikipedia — Postage stamps and postal history of Muscat and Oman (CC BY-SA 4.0)