1979 Trans on 7.5 L H Approval ?

Hello, I am about to buy a 1979 Trans on with supposedly original 7.5 liter machine. According to Wikipedia this machine has only been installed until 1976 (other series ). Now I get my question with this engine then at all an H registration? Vehicle is still registered in the NL which should be no problem to report it to in D. Many thanks in advance. MFG.Andy