Sam, trademark infringement is when a trademark, in this case both the name Marantz and the "Model 7", is used without permission of the owner of the trademark for any purpose. While there are exceptions from licensing such as in an article or non-commercial use, this is nether. It does not matter if it is on the faceplate, literature or in an advertisement. Think about what would happen if tomorrow some car company advertised a car as having a modded Chrysler Hemi engine and it had little in common with the Chrysler Hemi. Chrysler would I'm sure protect its name and the Hemi model designation. Maybe that brings it home or I'm sure you can think of an other analogy.
Plantguy, just to be clear, I am not Chinese bashing. My opinion goes to any product regardless of where produced that violates IP rights. Nor, did I suggest they were poorly built and can not, as I've never seen one. While early on, Chinese quality for audio gear was generally suspect, I've seen them improve to a point where they have shown they can compete with the best of them out there in terms of design and build. In terms of audio quality they, like any audio industry make from terrible to very good products. There generally still is some rough edges to Chinese manufacturing which relates to consistency of production quality but that is something every maker regardless of venue has to constantly address. This has been pointed out in news articles, product reviews and other literature so should not be a surprise. My last 2 of 3 audio purchases were in fact Chinese, an Eton/Grundig S350DL and about a year later another. I also, think they make some of the better fountain pen nibs currently in production.