Postage stamps and postal history of Hong Kong

Hong Kong formerly produced postage stamps with the name Hong Kong, with the face of the reigning monarchs of the United Kingdom, or with the royal symbols (e.g. "E.R."). After the Hong Kong's transfer of sovereignty to China, stamps are now issued with the name Hong Kong, China. British Hong Kong postage stamps are no longer valid for prepayment of postage or repurchased by the Post Office.