These were hinged in plastic protectors so no effect to the back.
We are far from experts on Stamps and grading is tricky but best we can tell these are certainly very fine but please base your purchase on the image.
Image is a scan done on a low level scanner at 600dpi, a slight unsharp mask applied to focus and then scaled for viewing.
Keep in mind images are of stamps in plastic sleeves.
Contact us prior to purchase for standard envelope mailing. This will be at your own risk but stamps will be carefully packed and sandwiched between cardboard. Cost will be $1.00 additional.