US First Flight Cover Northwest Airways Chicago to Minnesota 1929 US Sc 557 Coil.

The product is a used US First Flight Cover from Northwest Airways, originating in Chicago and ending in Minnesota. The cover was issued between 1921-1930 and features a 5 cent stamp (US Sc 557 Coil) with a multi-color design related to aviation. The cancellation type is duplex and the certification is uncertified.