Hi Ou,
I don't think they did. They did cast casting numbers into some parts and those numbers were usually fairly close to, but not the same as, the part number. For non-cast parts, back in the day I don't think they put any number on them but do stand to be corrected.
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 Nineteen
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Antique Caterpillar
Machinery Owners Club
1115 Madison St NE # 1117
Salem, OR 97301
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