Hong Kong Island was occupied by the British on this date in 1841 during the First Opium War–and was not thereafter relinquished by the British until July 1, 1997, when it became the Hong Kong Special Administrative Region of the People’s Republic of China. The 1997 Handover was, as you’ll recall, part of the lease enacted in the Second Convention of Peking giving sovereignty over the New Territories to Britain for 99 years (signed in 1898). Oh, colonialism. What a funny beast you are.
Stamp details: Stamp on top: Issued on: December 8, 1862 From: Victoria, Hong Kong SC #1
Stamps on bottom: Issued on: July 1, 1997 From: Hong Kong, China SC #793-798