This Greek stamp features the Byzantine Church of St. Catherine (Agia Aikaterini) in Thessaloniki, a UNESCO World Heritage site. Issued in deep brown, it highlights the intricate arches, domes, and masonry of this late 13th-century monument from the Palaiologan era. The design reflects Greece’s dedication to showcasing its historic architecture and Orthodox heritage. A fine example of mid-20th-century Greek definitive issues, this stamp is sought after for its architectural theme and cultural significance. An essential addition for collectors of religious architecture or Greek philately.