The 6 indicates which plant the truck was built at.

1 = Flint Mi.
2 = Tarrytown N.Y.
3 = St.Louis Mo.
4 = none
5 = Kansas City Mo.
6 = Oakland Ca.
7 = Fort Worth Texas (to May 1921)
8 = Atlanta Ga. (April 1928 on)
9 = Oshawa Ontario Canada (Nov.1915 - Dec. 1924)
9 = Norwood Ohio (opened Sept. 1, 1923)
12 = Buffalo, N.Y. (opened Aug. 1923)
21 = Janesville, WI. (opened Feb.1923)
22 = Tarrytown N.Y.(Chassis/Cowl For Export)

Thanks to Ken Kaufmann & David Hayward
for this info is useful

Last edited by 41Chevy; 01/15/2012 10:35 PM.
"If it ain't Steel it ain't Real"
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41 1/2-ton, a work in progress
68 Shortbed stepside 327/325hp/700R4