I will take better pictures and post them later, but these 3 PE frets came with a KORA 1/72 Mitsubishi Ki 21 upgrade set, but I don't believe it is actually part of it. I imagine the seller just threw it in with the rest of the stuff they sent me. Not sure if the decals are part of it (I doubt it) and the little sheet of instructions is in Czech(?) and may not even be associated with the PE.
KAREL mosaz 0,16 is etched on all 3 sheets if that helps.