https://bringatrailer.com/listing/1999-honda-rs250r-gp/ Can't remember the user here who owns this, but I certainly remember those pictures!!! Good Luck on your auction. I hope you get what you want out of it. Just contacted BAT today about listing a Z50 I have.
1970 - Z50 2 owner, Columbia, SC bike since new. Pretty much all original except cables/hose's/front fender/foot pegs New rings as it smoked a little when purchased from the original owner.
My first bike was a teal blue Honda CT-70 with the 4-speed manual transmission. Got it around 1971 or 72. My dad probably paid $350-375 for it new. Those things bring >$5K on BAT every time.