Montana 1993 Trans (New Vehicle Transfer) License Plate 21 - 4

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Montana TRANS license plate from 1993. Number 21 -4
I thought this was what they used on big rigs, but the paperwork attached to the back (which has an incorrect ZIP code for the licensee) is a Certificate of Registration of Transporter of New Motor Vehicles. Collectors surely know more about this than I do.
Images is from a scan, not a photo and not retouched. Flaws are apparent.
Plate size is about 7 wide, 4 high.

Sale Price: US $8.00