"CTM" is on the Distributor Label, not the Colt Label and it is a distributor code for Colt (CT), Model (M), then most of the Model Number (3040). It could also stand for Colt (CT), then most of the Model Number (M3040). By the way, I have a number of NIB Colts from the 70s with Distributor Tags and I keep them unmolested. In some ways it may help to authenticate a box or Colt label.