Order Vintage silver portable double burner

Product Name: Order Vintage silver portable double burner
Ok so I am not sure what this order piece is really called but it's very old and seems as tho it's never been used. It's got some old school markings under each handle and they are different on each side. I don't know what they mean, I don't know what the metal is, I seriously don't even know how to research this piece because of my lack of knowledge. I've priced it based off of what I paid for it thinking I would be able to easily locate information on it. I really am at a total loss. Maybe if u know something about it and could offer me some info that would be nice. Thank you.