It is cast iron and from the 70's I believe. These older ovens are awesome. The finish seems to have started out finer and has improved with use. This one has the indented number on the lid and an imperfection in the cast that is a squiggly line I tried to photograph.
It is not a crack that goes through the lid. I have used this for a while with no issues. It is great for baking pizza or breads. It works great for large groups. The item "Lodge huge 16 Camp cast Iron Dutch Oven Discontinued model" is in sale since Friday, December 01, 2017.This item is in the category "Collectibles\Kitchen & Home\Kitchenware\Cookware\Cast Iron". The seller is "rhuffer2" and is located in Salt Lake City, Utah. This item can be shipped to United States.