That is a nice ol’ feller. Looking at the ID plate: 6KSI 1563 - 6 = Oakland, Ca. KS = 1952 3800 1-ton.
I = September. 1563 shows it was # 563 to be assembled that year. I’m not sure what the stamped digits are above the serial number?
Interesting about the extra digits above the serial number.
On my 1951 3100, also an Oakland CA built truck, it has C 51 76 above the serial number. So I'm guessing the 52 on 57NAPCO's panel indicates the year, and the 51 on my truck also indicates the year. Maybe it's for people who didn't have access to decode the KS or JP in my case as the year and model codes. No idea about the C or the trailing numbers. I''ve seen a 1950 2-ton from the Norwood, OH plant (code 9) that didn't have those extra digits.
