D6 1955 9U18386-9U21450
Here is a very good page to reference years by serial number:
https://chriscomachinery.com/caterpillar-machinery/
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
| 5875 STH GIPPSLAND HWY, NYORAChapter Thirty
| Booleroo Centre, 54 Arthur St, Booleroo Centre SA 5482, AustraliaChapter Fifteen
| Tulare, CaliforniaChapter Nineteen
| 34 Henty Hwy, Warracknabeal
Antique Caterpillar
Machinery Owners Club
1115 Madison St NE # 1117
Salem, OR 97301
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