These are all litho the first 5/8" and the others 13/16". All show Lenin and all include the years of his birth and death "1870-1924." The first two may be slightly earlier but the matching design and text of the second two indicate those are c. 1928-1933 during the first of two Five Year Plans. The first button is N. Mint. The second button showing Lenin pointing the way forward with vehicle carrying men with weapons below has small rub mark at top and small rubs over the dates below. Overall still Fine. The button reads "Hail The 5 Year Plan/Defend The Soviet Union." This is clean but has dent on lower right quadrant. The last button reads "Fight Imperialist War/Defend The Soviet Union." This is Mint.