I got this light gray Kellogg 591 for $20 plus $10 shipping back in June, and I finally finished reassembling it. I decided that I have too many projects to complete to take the time to sand out all of the scratches. There are plenty in the cradle area where a stubborn sticker had been. The phone arrived with a 1973 vintage ringer with an open coil, so I replaced it with a 1955 vintage WE ringer which works well. I also had to replace the transmitter. I cannot quite read the date on the bottom, but it looks like "5 58".
Larry