It is a 5 inch celluloid pencil with a nose-drive mechanism, using 1.1 mm lead. The cap pulls off--there might have been an eraser inside at one time. There is room for extra lead. It is a little bit thick at 3/8 inch in diameter. It has a single gold band above the clip. My other flat-top model has two bands, a contrasting cap, and capital-letter marking on the clip. (See it here: Pleased To Meet You.)
Just when you think a celluloid marble design (like this one, for example) is too over-the-top, you discover that black and gold marble really does occur in nature. How striking!
And so my love affair with Eclipse continues.