I would say the colour wasn't common but this is likely because it simply wasn't popular at the time. I have though seen them over the years.
With the trim you had Slate Black 18V and Black 19V both were used in HJ Sandman's. There was different "grains" used but this is typically long grain and roebuck. Pretty sure HJ were long grain. Sandpaper grain in latter models on certain parts.
I'd say you are right. Only Sydney/Pagewood stamped the firewall from what I remember.
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