All About Pocket Knives

i have this small spring knife.and leather case. it springs open when you pull the ball at the bottom.and locks. and springs shut when you push the ball.
has any one any info on this knife.?

What they call a pull ball, about all I can tell ya.

Pull ball knife usually refers to a George Schrade made small switchblade knife with a spring mechanism and a pull ball release. The knife pictured here does not look like a swithblade but rather a mechanical pull-push mechanism.

Mechanical gear knife, not a spring knife.
Patented by (and probably made by) Giesen and Forsthoff, Solingen.