Singer Serger Upper Knife
Serger Upper KnifeFits Models, 14U65, 14U344, 14U354, 14U234, 14U34, 14U286, 14U13, 14U23, 14U53, 14U12, 14U32, 14U64, 14U285, 14U44, 14U85, 14U52, 14U244, 14U44B, 14U4D,  14SH654 and Pfaff model 756412585