Looks like it was rebuilt by a Honda Mechanic in Madison, WI. Good looking bike if you might need something a little lighter. Here is the link and writeup for the ad:
https://www.gl1800riders.com/threads/1979-cb750-ten-year-edition.463683/ 
Asking 2,500, can deliver up to about 500 miles from La Crosse, Wi.
If you're interested, dont be afraid to ask about it or make an offer. I bought it for my stepdad for his birthday in April but it hasn't been ridden since.
I bought it from a motorcycle tech that works at a honda dealership in Madison, Wi.
He did everything that you see done, wrapped tubes, etc. I know he owned it for 3-4 years.