Hey John, Interesting to find you on in a Cletrac Forum...we have a big 40's model mobile yarder here.  Still not sure what the model # is, but it's quite a machine.  Our address here is:
 Collier Memorial State Park
 46000 Hwy. 97 N.
 Chiloquin, Oregon  97624

We have found some pictures of Case #1 and of #25, but the axle on 25 has been modified we believe.  Am still trying to figure out how to get hold of the Smithsonian to get some close-ups of #1!
I'm leaving here, moving to Florida in mid-April, so if you send something, please address it to Jim Beauchemin, Park Manager.
Thank-you, look forward to seeing what you have, Larry