The Kawaguchi comes in a white box with all the regular user manual, cartridge and converter. There is nothing particularly special about the packaging other than having the name of the pen printed on the inside of the box.
Kawaguchi is made of a blue resin with lines etched across the body in a wave like pattern. The blue resin isn’t exactly the same shade as the regular Chartres Blue’s. Also instead of gold accents, Kawaguchi has silver accents. One plus point, Platinum has thrown in a matching silver converter with this pen. I feel the lines help to enhance the feel of the pen when compared to the standard Platinum 3776 Century. I can tell it is a slightly more premium product.
Like all other 3776 Century, the Kawaguchi also has the slip and seal technology. However this is also a cartridge converter fountain pen, the ink capacity isn’t fantastic. It is unlikely to leave your ink in there for 2 years unless you forgot all about it. Personally I never had the opportunity to really try it out.