Auction: 19033 - Stamps and Covers of South East Asia
Covers and Cancellations
1891 (28 Apr.) "O.S." envelope (182x97mm.; a little truncated at right) registered from Sandakan to USA, showing superb 49mm. double-ring
Note: North Borneo joined the U.P.U. on 1 January 1891. Under U.P.U. regulations letters on Post Office business were free of postage.
Patrick Cassels, April 2008