Please note that I am looking for the text font, NOT the ‘Marantz’ font.
I suspect the font was a draughtman's font, rather than a typesetter's font. It is very similar to many fonts, but the cross and the A on the close ends of the C tell me that it's something just slightly out of the ordinary, but none of the public, web-based font finders have identified it. The identifiers have occasionally come up with somethings vaguely similar, but the devil is in the details, and none of the the finders have been able to separte that aspect. :-(
Thanks for any help you can provide. :-)