These “Lightning jars” became popular because no metal (which could rust, breaking the seal or contaminating the food) contacted the food and the metal clamps made the lids themselves easier to seal and remove (hence the “Lightning” name) .
There were many similar glass lid and wire-clamp jars produced for home canning all the way into the 1960s.
Antique Mason jars are sought by collectors, and are bought and sold not only through antique stores, but also on auction sites such as e Bay.
The value of a jar is related to its color, embossing, closure, age, rarity, design, size and condition.
Although other companies began creating the jars, Mason held the patent, and so the style of jar became known as a Mason jar.