I bought this regulator last year supposedly from the original owner. I was told it had never been used. I take that with a grain of salt and so should you. That being said I have no reason to believe differently. This reg looks as though it has never been used. The chrome is almost perfect. Although I have not opened it up, the inside that I can see is spotless. Absolutely pristine condition. I'm honestly not sure what this is worth. Let's say $400 obo. (Make an offer and if I'm off my rocker say so.)