The G1355 that performed in the Nbraska tractor test in 1973 is coming up on auction on Auctiontime.com. The decal indicating the test number(1141) is still attached to the back of the cab. The serial number matches as well. The tractor was painted Oliver green at some point, but is morphing back to it's original color. I talked to the owner years ago, and he said it was overhauled at one point, as most were. I see it has the external oil pump.
http://www.auctiontime.com/OnlineAuctions/Details.aspx?ohid=10288655&lp=TH
http://www.auctiontime.com/OnlineAuctions/Details.aspx?ohid=10288655&lp=TH