The OC 12 has a decal from a dealer in East Bethany, NY by the name of Batavia Greenway Inc.  The decal lists them as a White Motor dealer so the timing doesn't work out.  I have this dozer completely torn down (minus engine as it runs fine) in preparation of sandblasting and paint.  I'm looking for tracks and some rollers to finish the project.
I found the serial number plate on the 1365 under the steering wheel just as you said.  It's a 1973 model.  The serial number guide I was using indicated that the number was on the front engine so didn't look elsewhere.  Thanks for the info....Dave