Well it is 1977 complianced! Technically though it is a 1978 model HZ. BUT here's another spanner: 1977 complianced HZ's seem to all have AHZ chassis numbers whereas 1978 complianced HZ's are BHZ, so there is another ADR change there around the start of 1978 that means 1977 complianced but 1978 model HZ's are a special little subset of HZ with more than one little oddity. Although this isn't uncommon either, early HQ, early HJ are also unique compared to the rest of the series. The truly unique cars though are always the pre-volume production examples built for brochures etc.
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