This is a Model 40 Modified in Emerald acrylic. We gave one of these away for a drawing at the Raleigh Show and quickly sold a couple extra. We've made 3 more pieces for sale here.
The 40M is a long capped pen with no finial or clip, with a tapered barrel to allow for deeper posting making it well balanced and quite comfortable in the hand when posted.
$165. Nibs start at $25.