1931 Switzerland Pro Juventute 10c Postage Stamp

This is a rectangular postage stamp from Switzerland, specifically from the 1931 'Pro Juventute' semi-postal series. The stamp is printed in a monochromatic grey-black ink on pale greyish paper. The central vignette features a detailed landscape illustration of a dramatic Alpine mountain peak, possibly the Piz Roseg or a similar massif, with a small chalet or mountain hut visible in the lower-left foreground near a winding trail. The text 'HELVETIA' is prominent at the top left, with the denomination '10' immediately below it. The words 'PRO JUVENTUTE' and the year '1931' are printed centrally on the left side. The stamp has standard perforations on all four sides. Notably, it is mounted on a black background, likely for display in a philatelic collection. A partial circular black cancellation mark is visible in the lower-right corner, indicating the stamp was used for mailing. The condition appears fair to good for its age; while the perforations look mostly intact, there is a visible smudge or marking in the top center margin. The engraving shows fine linework, typical of Swiss high-quality intaglio printing of the early 20th century.