The brand reads like an 1891 case file opened in the Alps: aged ivory stock, iron-gall ink, the bottle green of a travelling coat and the tweed of a deerstalker. Red appears exactly where the plot does, seals, buttons, the thread under the rule. Bodoni Moda plays the Strand Magazine headline; Xanh Mono's typewriter italics play Watson's notes.
Two recurring devices: the falling-water divider, vertical threads broken by a red rule and a single red drop, and the wax-seal numeral for section numbering. The logo mark sets the fall between two cliff strokes over a hint of spray.