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The DSTB is part of the Instrument Collection from Arnold & Son, the NAC grey treated movement features Haute Horlogerie finishing with hand-chamfered and satin-finished lever and bridges, polished edges and fine circular graining and Côtes de Genève rayonnantes. The visible dial plate is black ADLC treated with large circular finishing, and screws with bevelled and mirror-polished heads. The true beat seconds are superbly indicated via a large sapphire dial that occupies the top left portion of the dial. The dial is silvery opaline, sapphire. Case is stainless steel, cambered sapphire with anti-reflective coating on both sides, see-through sapphire case back. Strap is hand-stitched black or brown alligator leather.