Seller has listed this as a 1941, but clearly it’s an M-38. The sides have been modified.
https://austin.craigslist.org/cto/d/mason-1941-willys-jeep/6820972802.html
“1941 Willys jeep with five digit serial number. One of the first 10,000 made that year. Serial number denotes it was made for the Marine Corp. MC66582. It has been converted to 12 volt and was running since conversion. Motor turns freely and will not take much to get running.”