These are not flat hinges. They are recessed on the strap and are made to screw on the side of door frame which would be out of sight when the door is closed. Please study the pictures to be certain they are what you want.
They are dirty and have surface rust in places. The item "Vintage, Set of 4 T-strap, Heavy Duty, 12x 7in Barn Door, Shed, Gate Hinges" is in sale since Saturday, August 17, 2019. This item is in the category "Antiques\Architectural & Garden\Hardware\Other Antique Hardware". The seller is "gailm207" and is located in Jefferson, Maine. This item can be shipped to United States.