WITH 600 days to go before China resumes sovereignty over Hong Kong, mainland businessmen are cashing in by selling off '1997' trademarks. Song Tijin, an entrepreneur from the eastern city of Xuzhou, hopes to gain more than 100 million yuan (HK$93 million) for his '1997 Commemoration Wine' trademark acquired in 1993, although the auction reserve price is only 3.7 million yuan. The trademark which covers all wines and spirits will be auctioned next month on the 11th anniversary of the signing of the Sino-British joint declaration, Mr Song told the Beijing Youth Daily. There is also a 1997 trademark for beer, bought in 1994 for five million yuan. The brew will appear in the shops next year and features a logo depicting a mother holding her baby, an apparent reference to the perceived relationship between Hong Kong and the mainland. A tobacco company in Nantong registered a 1997 trademark for its cigarettes which it then sold to another company for more than 10 million yuan. And finally a liqueur company in Anhui has registered a 'Hong Kong Return' trademark for its special reserve liqueur which went on sale this autumn.