Fairly large Original Thermos, it literally says original thermos right on it. This type of thermos is typical from 1920's-50's. Most of what I find is 1930's style, but they didn't exactly date them so its hard to say for sure and the early DDR basically kept making these unchanged from the pre war versions. This is quite heavy double walled glass with a steel base. The cup is made out of the same material as canteen cups. There should be a cork closure, but it is missing. Nice thermos, fairly clean. It is very usable.