It is about 40 years old. I use this when I start learning photography. At that time, camera is really a luxury item. We have to keep them in an air tight container to make the lenses do not get fungus. Actually, yhis glass container were used in chinese medical hall to keep expensive herbs. It is really air tight. We need to put oil on the lip and cover it. It is very difficult to open the cover. We need to use a thin knife and slide in between the cover and the container and push the cover to a side to have air going in before we can open the cover. It weight almost 15 kg. Really a treasure gadget to the photographer at that time.