Very rare and highly sought-after Japanese souvenir sheet issued on April 20, 1934, to commemorate the establishment of Communications Day. The sheet includes 4 "Ashinoko" airmail stamps (9s, 16s, 18s, and 33s). This is one of the most iconic and counterfeited items in classic Japanese philately, making the included certificate essential. • Country: Japan • Year of Issue: 1934 (April 20) • Catalog References: Michel Block 1 (Bl. 1) / Scott #C8 / Sakura #B1 • Condition: Please examine the high-resolution scans carefully to evaluate margins, gum status, and overall condition. • Authenticity: Comes with a photographic certificate of authenticity (expert/signature clearly visible in the attached photos).