OK, I just came on a reference to an International S11 Skidder. After spending quite a bit of time on-line, I finally found some other rather poor pictures that tend to confirm Squizzie's find as being an S11.
I actually meant to write earlier that the dozer was a TD25, not TD24. But I've done some checking on the TD20 model after WabcoMan's comment, and sure enough, it's a TD20 with a Rolls Royce engine. The air box for the engine air induction is what threw me off, plus the cable runner pipe along the right side, which compared favorably with one of the TD25 pictures my International book has. Stretch mentioned International too and that rang a bell.
I slapped myself a couple of times later when I thought, Squizzy is at an International museum, dummy, not one for Clark's or Timberjacks.
I'd still be interested to know what they ran off the sheaves on the ROPS.