I have read that 8600 narrow gauge 3J series, and 10,561 wide gauge 5J units were produced, and 7560 4U series, and 18,894 5U units were produced.
John
http://www.chriscomachinery.com/D2serial.htm
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.
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