This ringtop has a rear-drive mechanism. To advance the 1.1 mm lead, you turn the bell top, which has thoughtfully been provided with a nice incised rim to turn it more easily.
The mark reads MOORE (with the joined Os) and under that "GOLD FILLED PAT. OCT.13 25."
The same size pencil was made with a simple clip attached to the cap, and a larger 1925 patent pencil was produced which had a clip embedded in the marble.
It's a smooth, substantial-feeling pencil. It was made from 1925 until about 1930.
Below, another of the 1925 patent pencils (black and bronze) along with a later green marble Moore.