This used to be a civil defense jeep.  Hopefully, there is some documentation to support it.

“This is a 1962 Willys Jeep. Used by the city of Brawly for civil defense.
Been sitting around for a while, needs work, but is in running condition.
It’s a M38A1, with an inline four Hurricane engine, 4×4 three speed, with low / high transfer case.
Clear title and tagged for for a year. Manuals available online for free, easy to find parts.
Call Dan for more information. 760.413.6759”

http://inlandempire.craigslist.org/cto/3127750056.html