This is a rare and highly collectible First Day Cover for the C21 Trans-Pacific Air Mail Service, featuring a beautiful blue design. The cover is addressed and in excellent condition, suitable for any collector of historical event stamps. The cancellation type is the highly sought-after First Day of Issue and it has not been certified. The denomination of the stamp is 25 cents and it was produced in the United States. Don't miss your chance to add this unique item to your collection.