I took a closer look today and daswolf has it right what looks like NYCRR is actually a mis stamp for New York. Even though it's not NYCRR, it's still awesome that it's so old and in great condition in my eyes. I looked at the directory that frank was talking about, very good info there. I know that the factory or forge is no longer there in lower Manhattan. There is a park there now at the attorney street address, unfortunately that was a dead end. Now do you guys leave the petina on the vise or strip it and clean the parts? Thanks