The grille suggests this is a mid-1947 or later.  I suspect this jeep is a mix of parts or mix of title/vin plate and jeep.

“title says 48 but numbers say 46, runs good has the L134 flathead 4 cylinder. also have soft top for it. starts and runs fine with a couple small things that need attention, such as the starter doesent always engage but will and starts fine. has exhaust leak where the manafold meets the exaust but have new gasket just havent done it yet. anyway come by and drive it, its fun. im looking for a sportster or a triumph that are in good running order. they dont have to be perfect just running good. 594-zero51three”

http://montana.craigslist.org/bar/3078119677.html