Most Jones under levers are from the early years of doubles. Call it from 1870-1890's. I know a few were made even into the between the war period but most are 120-140 years old. Worn out examples are numerous I am sure but I have seen a good many which worked just as well at they did when first made. Even when used in double rifles they seem to hold up well. Slow and steady they last a long time.