Sweden. Facit 9c2 on cover, 12 öre on small cover sent from "Helsingborg" to Denmark, cancelled upon arrival with only Danish pmks. The stamp is cancelled with numeral cancellation 34 (Kjøbenhavns jernbane postkontor) – most likely UNIQUE on Swedish stamp on cover. Other cancellations FRA SVERRIG, HELSINGØR 3.TOG 4.7 and KIØBENHAVN 4.7. The cover is strengthened on the inside. Certificate HOW 3, 3, 2, 4 (2022).