This is a common flag question.
All our flags are made and display correctly. By "correctly" we mean they are backwards on the back of the flag.
All flags naturally have a front and back sides. For example, words that appear on the front of a flag almost always appear in reverse on the back of the flag.
It is unusual to have a truly double-sided flag that "reads" correct on the back. To accomplish this you would have to sew two flags unnaturally back-to-back.
BUT, DON'T TAKE OUR WORD FOR IT.
In the image below you can clearly see the Marine Corps flag has reversed letters on the back (look at the bottom of the image and the word "Marine" is reversed. The word above it, "United", curls around and is correct (so you know we did not doctor the image).
We'd not suggest to these gentlemen that their flag is anything short of correct.