Wooden chair with a metal stamp, marked United Nation A 85

I received this chair at a public auction. I didnt buy it because I knew what it was or what it might be. I bought it because I thought it would be a nice chair in my office and the price was very low.

When I got home I noticed the metal stamp that says United Nations A 85. I searched google and came up with absolutly nothing. So here I am hoping someone here can help me out, with any information at all. Below I will list as much as I can about it.

Metal stamp marked United Nations A 85.

Solid wood all around.

All screws are flat head screws.

Wheels on the bottom are held on with metal and the wheels themselves are a thick hard plastic.