I acquired my 1911 with lots of scratches and even a little surface rust. It shoots great and I'm happy. Also, I don't have to worry about adding my own scratches because they just add to the character of the gun now.
That being said, I didn't pay LNIB price for it so yeah, any scratch or wear diminishes the value.
That being said, I didn't pay LNIB price for it so yeah, any scratch or wear diminishes the value.