C28 TWIN-MOTORED TRANSPORT PLANE Sheet of 50 US Airmail 1? 5¢ Stamps MNH 1941 Updated on September 8, 2023 By admin Comments Off MNH Sheet of 50 Stamps. Transport Plane Series – Brown Carmine. Share Tweet By admin You May Also Like C28 TWIN-MOTORED TRANSPORT PLANE Sheet of 50 US Airmail 1? 5¢ Stamps MNH 1941