Brian - I was thinking just like you. Could it be Great Minds Think Alike? (You, me and Albert E?) I think Lewis is playing games with us.
Lewis - the Kohler Serial No.3020245 comes up as built 1971, which seems early in the 127 production. I think you said this is not your tractor but until I see a close up pic of that sticker tag I'm still gonna think it's a replacement engine/short block, just like Brian suggested.
Now, Josh thinks he got off the limb, and my saw is all dulled up, and some of the others on here are see-sawing on this tree so I'm going to drop this thing and run. For what it's worth there are some interesting pictures and captions on page 29 of the 1x6/7 Operator Manual that do look something like the tractor in your pics.