Cool Friedmann and Lauterjung, any info?

[stingray1968]

Here's a cool one, I've never seen a pocket knife with a magnifying glass made into it! It's REALLY heavy, can anyone tell me the age and/or value of this knife? Anyone know the type of wood used? The blades are shot which is a shame, could they be reforged? Should I even consider having that done? I know that Friedmann and Lauterjung were in business in the late 1800's making concave electric razors, scissors, and knives, but does anyone have any additional facts on the topic? Thanks!