Following the release of 2012’s Black Water Dragon pen, David Oscarson has produced another writing instrument inspired by Chinese astrology. The Black Water Snake pen, which Oscarson introduced late last year, is the 20th limited-edition release from the St. Louis artisan and his second to incorporate an overlay—in this case a pair of diamond-eyed snakes slithering up the cap. The top of the cap is inlaid with black enamel in the shape of the Chinese character for “snake,” while the pen’s barrel is decorated …