Pocket lock knives are offered in countless variations, which add to the mystique of collecting. Pocket knives have been popular items for quite some time, with various refinements to the design being introduced over the ages. Pen knives, for example, were carried by gentlemen in the 19th century for the purpose of sharpening the quills of pens, while larger blades were carried by stockmen and explorers for an assortment of purposes. By 1900, the locking blade had been introduced, making pocket knives much safer since the blades would not snap shut under pressure.

Here we are in 2012 and lock knives are still as popular and essential as ever despite all the negative publicity in the national newspapers. 

A good pocket knife can be an extremely useful tool in a wide range of situations, and they are common equipment for campers, farmers, and emergency services personnel among others.