In 1967 the Greek coup d'etat was by the tanks, in 2015 by the banks

Yanis Varoufakis, audio here, says Tsipras felt defeated by the "No" in the referendum:

"In the [1967] coup d’état the choice of weapon used in order to bring down democracy then was the tanks. Well, this time it was the banks." (at 10:55 into the interview)