I'm guessing that this is the machine?
https://phoenix.craigslist.org/evl/hvo/d/gilbert-1926-caterpillar-30-tractor/7820380214.html
CrawlerAddict
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
Chapter Two
| Highacres Farm, Dewey Lane, Brackenfield, Derbyshire DE55 6DB, UKChapter Nineteen
| 2 Winkleigh Rd, Exeter TAS 7275
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