Got this in a lot of razors recently. Case included but neither blade box was there. It has the older Gillette logo that I think dates it to pre-1910. There are no markings anywhere on the head of the razor. Only a worn number (serial?) inside on the lower piece. I might be able to make out the number if it makes a difference. Any idea which one this is? I think I read these were designed with old blades in mind and although a new DE blade fits, it will be overly mild, correct?