In Canuckland it's called a Flat Top American.
A Baron Rollerball. (pay particular attention to the matching finial!)
It's mate, a Sedona Rollerball.
Each pen was finished with 6 coats of Med. CA (spritzed btwn coats with CA accelerator) with the lathe running. Each pen was then gently sanded with 600 grit with the grain of the wood. Another 6 coats of Med. CA was applied (same spritzing with CA accelerator).
Then wet mm'd (dish detergent added to the water) from 1500 grit to 4000 grit. All pens were then buffed with Formax Buffing Compound (.6 micron) and a layer of Carnuba Wax.