The 10-R "Retro" is designed with a vintage flavor in mind. The pen is only available in a 12mm cap thread - the body and cap are 13mm and 15mm respectively. With a slightly longer body and shorter cap and section, the proportions take on a vintage feel, all in a smaller pen than is commonly offered among artisan pen makers. We integrated a weighted section, so the balance of this pen is wonderful. The model features an 076-style Bock #5 nib, as it is broader across the shoulders and offers a more vintage look. Rounded out with a converter filler system and a stainless clip reserved for the model, the Retro is designed for our customers who appreciate the size and feel of vintage pens while wanting the ease of using a modern pen.