These pin-on-medals in 99.999% of all cases are not military awards but party, commemorative and ceremonial distinctions , issued by the Kuomintang government and that of the PRC, in the millions. Due to the price, average about 20c per piece, I can hardly imagine that someone would be interested in faking them.
That some foreigners might even pay 2-5$ a piece at those flee-markets is known to the sellers. However the number of those tourists is totally negligible towards a business view of producing fakes, since there are millions and millions of originals floating around.
Anyhow, as the star shows it is from the Kuomintang era, (ended 1949) as such certainly not from the Korea war era. The translation from "1812 overture" is correct.
Regards
v.Perlet