Here is a vintage roll over (or bottoms up) style jigger with stepped detail. It is marked “Industria Argentina” (mark somewhat faint) but no indication of the material or maker. I am estimating this is circa 1950 but it could possibly be 20 years either side of that I would guess. As far as the metal, I’m not certain. I’m thinking it is silver plated with a lacquer coating. There appears to be dark areas of tarnish but because I suspect it is lacquered, I have not attempted to polish it.
It measures 5 inches across including handles (photo looks a little longer but it is an optical illusion). The top diameter of the cup is 2 inches, bottom 1 inch. It is about 1 and 5/8 inches high.