Bill, I think I found your old bike.

It's located in the attic of a vintage motorcycle shop in Osaka, Japan. Here's a recent picture of it. This is the one...right?
Well, that COULD have been it, before I got hold of it. You see, I had gas tank and fenders painted a pretty metallic Blue, had the side cover chromed, replaced the headlight and gauges with new parts that were fore the CB350 that had just come out, when I bought the CB72 AND had put on a set of megaphones, along with one of those race seats that you see on ebay for around $1600 (mine didn't cost near THAT much). I wish I could find a picture of it AFTER the mods (slightly warmed the engine up too and could take on the Super Hawks, but not the 450s).