Wow that's a nice grader! Even has the original aluminum rain cap that Cat sold back then!
It sounds like a big 3 cylinder engine too.. At 47 HP.
Have you got a price in mind?
https://www.facebook.com/marketplace/item/1468002983620805/?ref=search&referral_code=null&referral_story_type=post&tracking=browse_serp%3A7926dd18-7a68-45f5-9176-eb0ec3b94b0d
You may want to look at the ebay posting. It is a bit tense juggling the various sites. It is on an active auction right now. Facebook required a number and I took a flying toss at it. It is for sale and it has a starting number other that that above.
https://www.ebay.com/itm/115476851071?mkevt=1&mkcid=16&mkrid=711-127632-2357-0