I was given a print or poster, well I,m not sure what it is about 25 years ago, It is by eli lissitzky I appears to by signed in pencil, only problem is on the borders of the print are the words russian art of the revolution, the brooklyn museum june15-july 21 1971 lissitsky had been dead 30 years

but it appears authentic, I don't know any thing about art any help would be appreciated