Set of Vintage RARE CASE XX Steak Knives CA 554 with Original Wrap Case CASEXX

The product is a set of vintage RARE Case XX steak knives, model CA 554. The set includes 6 stainless steel steak knives in a silver color. The knives come with their original wrap case. These measure slightly over 8 inches long. This set has been stored in a blue felt silverware pouch with a leather exterior (not sure if it's real leather). The case will be included with the purchase. These were my grandmothers and she likely got them sometime mid century.I inherited this set and know nothing about its value, history or authenticity.