Real photo postcard showing the Puente de Guayalejo (Guayalejo Bridge) along the Carretera México–Laredo. Features a steel truss span with stone abutments, riverbed debris in foreground, and wooded hills in background. Caption in negative reads “M164 – Puente de Guayalejo – Carretera Mexico Laredo,” with signature “Martin.” Back is unposted on Kodak Mexicana Ltd. photographic stock. Highly collectible infrastructure and early Mexican highway subject.