Somewhat more difficult to complete used with #56a being a particular rarity, Oman in reference to the British Postal Agencies in Eastern Arabia can also be found catalogued under “Muscat and Eastern Arabian Agencies”, “Muscat and Dubai and Arabian Gulf Agencies”, or as it is currently designated in the UK, “British Postal Agencies in Eastern Arabia”, to reflect the wide usage of these issues in Muscat, Qatar, Abu Dhabi, and Dubai.
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