Wow! that maaay be the correct ribbon. hold on to it for grim life, because I can't find one anywhere. the Patriot resistance medal itself, issued under HRH Sellassie, was very rare. a Derg era reissue is even rater.
Ilya, the only published work so far are 2 basic articles in Orden (in German) from @. 1980.
the reissues came later, as they not mentioned in the articles published decrees. almost ALL the Derg medals seem to have followed a Tricolour pattern of some sort, making reading a ribbon bar easy. The notable exception is the bravery medal.