<p>The Nomos Ludwig Duo is a classic, but in a slightly more delicate form, with a diameter of 32.8 millimeters. The enamel-white dial with Roman numerals and the suitably fine velour strap complete this impression. Equally stylish, the manual winding Alpha.2 movement, with hours and minute display, ticks away inside.</p> <ul> <li>Reference <strong>242</strong> has a closed case back.</li> <li>Reference <strong>249</strong> is identical but has a see-through case back.</li> </ul>