I have a KR-7200 found under similar circumstances! Very nice. Does it have the engraved lettering as well? I was also surprised that the front panel is a solid alloy casting. I'm so used to fake chrome trim over molded plastic that when you see real chrome over real metal you sorta do a double take. The 7200 has a nice 4 gang tuner and is 55 wpc. I've been looking to see if there was ever an 8200 or 9200, but I can't find anything. I think this is a real overlooked lineup in the Kenwood ranks, but also not very common.
Where did you find the owners manual on the web?