Oman Timline (01-Jan-1921 - 31-Dec-1930)

1a
Title: Imperial Inland Postage Rate: 1922 to 1931 Postal Administration: Indian Postal Administration
Earliest Usage: 24-Apr-1922 Latest Usage: 14-Dec-1931
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0.5a
Title: Imperial Inland Postcard Rate: 1922 to 1931 Postal Administration: Indian Postal Administration
Earliest Usage: 24-Apr-1922 Latest Usage: 14-Dec-1931
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2as
Title: Airmail - Internal Indian Rates - 1929 to 1931 Postal Administration: Indian Postal Administration
Earliest Usage: 31-Dec-1929 Latest Usage: 30-Nov-1931
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REGISTRATION LABEL
Title: Type r9A - The “MUSCAT DT ARABIA” Handstamp (REDUCED) on Registration Labels
Earliest Usage: 21-May-1927
Latest Usage: 07-Oct-1933
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3as
Title: 3as Foreign Letter Rate: 1921 to 1931 Postal Administration: Indian Postal Administration
Earliest Usage: 01-Apr-1921 Latest Usage: 30-Nov-1931
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3as
Title: Air Fee: 3as to the United Kingdom via Basra-Cairo – 1927 to 1928 Postal Administration: Indian Postal Administration
Earliest Usage: 07-Jan-1927 Latest Usage: 25-Mar-1928
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6as
Title: Air Fee: 6as to the United Kingdom via Basra-Cairo and Marseille-London – 1928 to 1929 Postal Administration: Indian Postal Administration
Earliest Usage: 26-Mar-1928 Latest Usage: 29-Mar-1929
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6as
Title: Air Fee: 6as to the United Kingdom via Basra-Cairo and Marseille-London – 1929 to 1934 Postal Administration: Indian Postal Administration
Earliest Usage: 30-Mar-1929 Latest Usage: 27-Nov-1934
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2as
Title: 2as Surface Fee to the UK and Empire Destinations – 1921 to 1931 Postal Administration: Indian Postal Administration
Earliest Usage: 01-Apr-1921 Latest Usage: 30-Nov-1931
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2as
Title: The 2as Express Delivery Fee - 1930 to 1948 Postal Administration: Indian Postal Administration
Earliest Usage: 01-Oct-1930 Latest Usage: 31-Mar-1948
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3as
Title: Air Fee: 3as to Continental Europe via Basra-Cairo – 1927 to 1928 Postal Administration: Indian Postal Administration
Earliest Usage: 07-Jan-1927 Latest Usage: 25-Mar-1928
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6as
Title: Air Fee: 6as to the Continental Europe via Basra-Cairo and Marseille-Paris – 1928 to 1929 Postal Administration: Indian Postal Administration
Earliest Usage: 26-Mar-1928 Latest Usage: 29-Mar-1929
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6as
Title: Air Fee: 6as – Continental Europe via Imperial Airways Service to London – 1929 to 1939 Postal Administration: Indian Postal Administration
Earliest Usage: 30-Mar-1929 Latest Usage: 01-Sep-1939
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OTHERS
Title: "BY AIR" Circular Hand-Stamp
Earliest Usage: 08-Apr-1929
Latest Usage: 13-Feb-1930
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6as
Title: 6as Air Fee: Desert Airmail Service from Baghdad to Cairo Postal Administration: Indian Postal Administration
Earliest Usage: 19-Jan-1921 Latest Usage: 12-Dec-1923
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