Sarawak- Rhinoceros Hornbill ( Buceros rhinoceros)

From the definitive pictorial series first issued in 1955, here is the 6d greenish blue stamp featuring a 

Rhinoceros Hornbill    (Buceros rhinoceros)

 postmarked in Miri, Sarawak unfortunately the date is not too clear.

Singapore-Our Garden in a City

My favorite type of bird covers are when I get multiples of the same stamp as you see here with the Orienttal Pied Hornbill. There's also a Crimson Sunbird  illustrated on these stamps .