USA stamped envelope 1911 Carnegie Steel Company, Pittsburg, PA to Bellwood, PA. 

Check out the pics for the condition. 

The envelope has been opened on the side and is empty. 

In the next couple of months/years, I will be listing thousands of rare FDC's and stamped envelopes from all over the world. 

We combine shipping costs. Please ask for my invoice if you buy multiple items.