Awesome Acrylic Pen/Pencil!
This is a nifty writing instrument. It's a squat, beefy acrylic / celluloid item. Body is wide & crafted from a marbled gold material... kinda gives off an agate-like appearance. It's a twist-advance model that's topped off with a marble / sphere & chrome clip. Calling it a pen / pencil because it's presently equipped with a Sharpie liquid graphite cartridge, so writes like a pencil, but pretty sure some common pen refill would also work. Distinctive appearance, works great!