Marantz AV7005 - Widow w/question

I’ve posted before on this item, but this is a new question. I’ve got this listed locally for $400. It’s got all the original accessories--the AM wire antenna, FM loop antenna, Audyssey calibration microphone, remote, power cord, manual and the original box. Plus it works & is in excellent condition--there isn’t a mark on it.

A potential buyer came over last night to look at it. He said a buddy of his who deals with used electronics told him there were 3 versions of this piece. The 3rd version was the best one as it was designed to prevent it rom overheating.

After looking at mine, he said it was the 2nd version & only wanted to pay me $200 for it. I said I’d go down to $375 (and I may have gone to $350, but I wasn’t prepared to accept $200 until I knew more. I said that when I researched the selling price, none of the listings I looked at ever mentioned the version their model was. I also told him I’d let him know, thinking that in the meantime I would check here to see if what he said was true or not. (Let me clarify: I don’t think the buyer is lying; I just don’t know if I believe what his friend told him.)

Does anyone know what this guy is talking about? If mine is the 2nd version, is $200 the going rate? (I’m seeing "sold" prices ranging from $290 to $900, with the average at $450.)

Thanks for any help you can give.