A coiled non-removable non-flat AT cable on a 42H1292-style Model M? Ehh-err.
Also, assuming it's the same keyboard as the one in that link of the measuring instrument, it's definitely not a Model M, the keycap profile is all wrong.
Furthermore, on 104-keys Unicomps, the Alt, Win and Context keys are the same size, but the Ctrl keys are bigger. You can spot that on the Customizer pic above. On that keyboard, they are all the same size.
Kishy is also right, the 'padding' around the actual keyboard is wider on a Model M than it is on that keyboard.