I ended up with dozens of these things, All sorts of different sizes. IBM used them everywhere and I am also a
PC junk collector. (according to my wife).
IEC C-13 is a standard without a standard. Just about any voltage from 100-250 can be coming out of that 50 or 60 hz. It just depends on what plug cap you put on the other end. They can take that idea too far.
Obviously a 1-15 is not right.