Hussamuddin defeated local favourite Stefan Ivanov to make the summit clash, where he will face Ukraine's Mykola Butsenko.
However, Amit Panghal (49kg) had to be content with a bronze medal after going down to another local favourite Tinko Banabakov in his semifinal bout.
In the women's draw, Meena Kumari Maisnam lost to Bulgaria's Stanimira Petrova to sign off with a bronze medal.
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