WANTed: Book: Greek Rural Postmen and Their Cancellation Numbers. Author: Derek Willan, Hellenic Philatelic Society of Great Britain. Publisher: London: Hellenic Philatelic Society of Great Britain, 1994. Series: Publication: Hellenic Philatelic Society of Great Britain #4. Book : 76 Pages ... ISBN # 978-0950-946139. Cancellations (Philately) Greece.