The Conklin Crescent Mark Twain Demonstrator is limited to 1,898 pieces (in remembrance of the founding year of the Conklin Pen Company) and consists of hand-polished, transparent acrylic resin; there is a black and a rose-gold trim variant. The pen works with the classic Crescent filling system in which a half-moon ring compresses the inner rubber sac; a locking ring on the body secures the mechanism against unintentional pressing. In the USA the black demonstrator edition is traded at around 250 USD and coloured versions at around 165 USD. In a case the pen fits, with care, into common single-pen cases, but the half-moon ring has some play and can press ink into the cap on awkward stowing; for permanent transport it is therefore only conditionally suitable.