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Old 10-05-2019, 05:04 PM   #3
Dave in MD
Senior Member
 
Join Date: May 2010
Posts: 175
Default Re: Door sill numbers

Ed,
These are production numbers for each of the 32 U.S assembly plants. The letter portion indicates the specific assembly plant (NK being the Norfolk, Virginia assembly plant).
We think the numbers are by body type and began with number one in late 1927 and then reverted back to number one with the introduction of the 1930 cars. We see these numbers mainly on the Ford built bodies but they do appear on some of the Briggs and Murray bodied vehicles. I believe there is a list of most of the plant letter codes on both the MARC and MAFCA web sites.
Dave
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