This is a very old vintage, single vial pocket torpedo level. It is 3 1/2 overall lenth. Looks maybe to be Nickel Plated Bronze or Steel? This was from my Uncle's tool box. I'm thinking this piece to be from the early 1920's or 1930's. I took the best pictures I could take, maybe you can see it better than I. It still functions so you can use it or collect it with your tool collection.