postpostochlophobist

Perhaps you didn't know that the hammer-and-plough was the original communist emblem before the plough was replaced by the sickle.  The meaning was the same - the unity between the industrial proletariat and the peasants.  The bottom image is the Red Army Official Badge of 1918, the top image is a modern replica, the middle image an authentic example.  The hammer-and-sickle, though in use since 1917/18, officially replaced the hammer-and-plough in 1922.