A stamp die assembly for a self inking stamp in which the die plate having printing indicia thereon is easily removable from the die frame. There are at least two locking bars on the die frame that engage in locking relationship at least two positioning tabs on the die plate. Locking tabs on the positioning tabs engage in a locking relationship the locking bars to securely attach the die plate to the die frame. The locking tabs are flexible so that when a force is applied to them they can be flexed to an unlocking position thereby releasing the die plate from the die frame.