Stop, get this book.  www.surplusrifle.com/reviews/mauserofworld.asp

Get it somewhere else, it is over priced here.  It will not give you all mausers, but will be a great start.

I have several books, a few that have not been published yet, but this is the one I keep by my desk.

Unlike a web site, you can take this with you to a gun show and look up what you are looking at.
There are hundreds of crests, and the rifles were made in several countries.  This book gives the info in short sweet paragraphs to keep it simple.

You will be happy with the book.  If you look at the right side of the page in the link, it tells you of all the countries it covers.

This is the third edition.  I have 1 & 2. And this looks to have more.

This should more than answer your question.

At the bottom of that link to German markings is a link to Claus Espeholts site.  It is a GREAT site.