Here is how a 1970 fender tag is stamped. This example is my own tag from my '70 Challenger. Tags are always read or written down from the bottom left corner first.
The codes I have underlined and marked are always in the same place on the tag. After all the main codes (up to the roof type and color code) the rest of the option codes are stamped into the tag in alphabetical order.
Any tag not stamped out like this could be a bad fake. But the guy stamping them was human so mistakes could happen.
The number of option codes a car has may be too many to fit on one tag. In this case the end of the first tag is usually stamped 'CTD' and the codes continue onto the second tag.
At the end of all the codes you will find one of the following;
END = End of codes (LA Plant)
EN1 = End of codes (Hamtramck production line one)
EN2 = End of codes (Hamtramck production line two)