Mecum Las Vegas Auction yesterday Thurs 23 Jan. Lot No. T272  1969 CB 750 Honda, 3 dig vin. sold for $40,700. Didn't say it was a sandcast.
 Link to auction is https://www.mecum.com/lots/LV0120-407041/1969-honda-cb750/ 

Full Las Vegas lot list    https://www.mecum.com/auctions/las-vegas-motorcycle-2020/lots/featured/ 

Here is a list of the Sandcast at this auction - 4 Sandcasts up for sale in the same auction. !!!! wow.

1/24/2020   F294   1969   Honda   CB750 KO
No Info
1/25/2020   S173   1969   Honda   CB750 Sandcast
No Info
1/25/2020   S201   1969   Honda   CB750 Sandcast
No Info
1/24/2020   F225.1   1969   Honda   CB750 Sandcast
No Info
1/24/2020   F234   1969   Honda   CB750
No Info
1/23/2020   T249   1969   Honda   CB750
No Info
1/23/2020   T272   1969   Honda   CB750
No Info
1/24/2020   F344   1969   Honda   CB750K0 Sandcast
No Info

Hi Guys,  I found this original tire from the Sandcast model on a Kawasaki  (sorry did I swear) rim at a swap meet in England. I bought the wheel just for the tire as I couldn't bear the thought that someone would buy the wheel and throw away the tire no knowing what it was.  So I pulled it off the rim and now it's on eBay.  I'm surprised at how pliable it still is, maybe it been hidden in a cold English shed for years rather than some hot American garage.

http://www.ebay.co.uk/itm/280811346126?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

If link doesn't work the ebay number is 280811346126

I started it low and it's a no reserve auction as I just wanted the tire to go back to the right classic bike. I'm not going to pull the auction early or change it to buy it now, I don't think that's fair on those who have been bidding and watching for days.

So good luck if you bid and I'll keep my eyes peeled for those Sandcast parts.     

Mick