What are the different Crown/ U proof marks? I see that Joop uses the abbreviation Cc/U. Is this different than the Crown/ U proof mark, or the same thing? Does someone have good pictures of Crown/ U proof mark(s)?
Will you ever see an Eagle/ N proof mark and a Crown/ U proof mark on the same pistol or only one or the other?
Are Police Banners marked with the Crown/ U, the E/N, or other proof mark, or does it depend on the date of manufacture? How do acceptance marks (e.g. Eagle/ L) marks relate to proof marks on Commercial vs. Police pistols, etc.?
What markings would a domestic Commercial (not sold as part of a contract) gun have?
As you can see from my other Want to Buy post, I'm trying to obtain a Banner Commercial and there is a lot I need to learn. I have some Luger reference books ordered, but I'm anxious to learn in the meantime.