Hi Fred,
Nice to hear from you.
I think it goes something like the early HQ models had a bright finish. Late in '73 the ADR's changed and the bright finishes were painted in a non-reflective manner. The Sandman's and GTS/4 models would have this finish in '74.
If that coupe is correct the blackouts on the bonnet are a later change in the GTS range as well I think. Im not sure about the fonts on the guages but the speedo has an after-market sticker instead of the true 140mph\220kmh speedo. Unsure as to the retractable seat belt, large hole console on a coupe as well. The orange indicators and the air filter having the bit on the snout are later as well.
I'm sure OZBox on this site would give you a much better explanation as to the exact times the change happened. He knows HQ details extensively.
Mauser
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