US Stamp #2372-75, 1988, 22c, 4 designs, Cats-40 Stamp Sheet, ATTN: NO GUM

The sheet is not perfectly flat. Minor waves are visible upon close examination. Please look at the images.

I had to soak the stamps apart because I didn’t store them properly. That’s why there is no gum.

Safe transport of sheets requires increased weight of envelope in order to protect the stamps.