All About Pocket Knives

Where is a good place to find out the markings ect to determine what year a H&R was made and/or who made it?
Specificly how can you tell if it was made before 1980? 1975?

There are some clues in Goins under the following headings:

C. Bertram Germany c 1865-1975

Bertram Germany c 1975 - 1980 (A.G. Russel)

Bertram Cutlery Germany c 1981 - present (Frost)

Have pictures of the knives your are wondering about?

Thanks for the information.

No I don't have a particular knife to try to identify yet, but before I buy another one I want to know what I am buying. Eventually I would like to find a stockman made before 1980