That’s a square tubed bumper.

“I have a 1947 Willys for sale. It’s a great little jeep, but I have moved on to another project. The jeep is mostly original with the exception of the 53 engine. A new gas tank was added about a year ago. I have the rear seat, but it needs to be repaired. It has some rust, but nothing bad considering it’s 64 years old. The jeep runs, but number 3 cylinder is oily. (possible ring job?) the title is clear and in my name. This would make a great trail project or hunting jeep. Email me for more info or pictures.”

http://albuquerque.craigslist.org/cto/2444379407.html