An antique engraved brass pocket sundial 5.7 cm diameter, 1.5 cm height with lid closed. An antique engraved brass pocket sundial. Brass pocket sundial; the lid screws off to allow the gnomon to be swung up from the. horizontal position. The hours are marked around the edge of the dial from 4 to 12 and then. on to 4 again. Hours are marked in Roman numerals, with 4 marked as IIII, instead of IV. It should work in the Southern Hemisphere, it just has to be oriented to the South instead of. to the North. Dimensions: 5.7 cm diameter, 1.5 cm height with lid closed.