In my SNID book it only lists two tractors but both are 7J & the 7J-1 up D4 came out in 1939 & they also list an RD4 7J-1 up with the same year it was made so maybe someone can explain that but maybe the RD4 7J was early 1939 & the D4 7J might have came out later that year but only guessing so don,t know.
Her is what my book has.
1939 1 - 1754
1940 1755 - 4110
1941 4120 - 7544
1942 7545 - 9939
1943 9940 - up catskinner
Hi Martyn, My list agrees with that of 'catskinner'.
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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