1941 United States.
Daniel F. Kelleher Auctions, LLC Sale - 628 Page 54
C29 - 1941 20c Rotary Press - Mystic Stamp Company
US Back of Book Air Mail Stamps 1941-1950 Year of Issue for sale
Buy US Air Mail #C25 - Transport Plane (1941) 6¢
US Back of Book Air Mail Stamps 1941-1950 Year of Issue for sale
US Back of Book Air Mail Stamps 1941-1950 Year of Issue for sale
C20 - 1935 25c Trans-Pacific blue - Mystic Stamp Company
US Back of Book Air Mail Stamps 1941-1950 Year of Issue for sale
1938-1939 Airmails #C23-C24 - Airmail Stamps - USA