| T I M E L I N E [1921 - 1930] |
| 01-Jan-1921 |
India used in Bahrain – Donaldson Type 4 – 1921 King George V Service Issue |
| 01-Jan-1922 |
India used in Bahrain – Donaldson Type 6 – 1922 King George V Service Issue |
| 05-Jan-1922 |
India used in Bahrain – Donaldson Type 6 – 1922-26 King George V Issue |
| 01-Jan-1926 |
India used in Bahrain – Donaldson Type 5 – 1926-33 King George V Issue |
| 02-Jan-1926 |
India used in Bahrain – Donaldson Type 5A – 1926-33 King George V Issue |
| 03-Jan-1926 |
India used in Bahrain – Donaldson Type 5B – 1926-33 King George V Issue |
| 04-Jan-1926 |
India used in Bahrain – Donaldson Type 6 – 1926-33 King George V Issue |
| 05-Jan-1926 |
India used in Bahrain – Donaldson Type 7 – 1926-33 King George V Issue |
| 22-Oct-1929 |
India used in Bahrain – Donaldson Type 5B – 1929 Airmail Issue |
| 23-Oct-1929 |
India used in Bahrain – Donaldson Type 6 – 1929 Airmail Issue |