@hy-brasil
Quote:
Aden didn't have their own stamps until 1937 and used Indian stamps back to the 1860s.
Actually, Indian postage stamps were introduced in Adan as early as on Oct 1,
1854 simultaneously with India and Myanmar following Article XXVIII of Indian Post Office Act 1854 (Act No. XVII of 1854) which was also applicable to Adan as it was under the postal administration of Mumbai Circle.
In the last quater of 1854, following quantities of Br. India 1854 stamps of 1854 ˝A, 1A and 4A lithographs and 2A typograph issues were supplied to Adan from Kolkata.
• ˝A: 8352
• 1A: 8544
• 2A: 240
• 4A: 396
But the earliest recorded cover with Indian stamps used in Adan, is from Mar 1855.
Here is an example of an early usage of Indian stamps in Adan, on an 1855 Adan-Mumbai cover franked with 2 Br. India 1854 4A Vic. head die II frame die I wide setting 2nd Printing imperf. bicolored lithograph (SG 19/Dawson and Smythies 10) with Robertshaw type 9/Graham type C2a/Lowe type C2/Proud type K1
124 cancels of Adan, and bearing Graham type HS8/Lowe type HS111/Proud type P4 tripartite rectangular
Paid datestamp (dt. Oct 10,1855) of Adan in red and Giles BG3 Mumbai GPO receiving datestamp dt. Oct 23,1855.

The cover was carried by Peninsular and Oriental Steam Navigation Company contract mail steamer SS Norna.
Rate: 8A was the steam postage for letters from Adan to India for every 14.18gm (˝oz) or part if sent by Br. packets, the rate in effect from Oct 1,1854 to Dec 31,1855.