Here's an example of a cover from the 150th Anniversary celebration to Amarah (Amara), Iraq. It was posted on the first day of the exhibition with the "-4 Ap 38" cancellation. On the back is the Exhibition Label, along with Receiving cancels for Basra and Amarah.



On another website, I read that there were many items handled on the first day of the exhibition (4400 ordinary, 2106 registered and 100 newspapers), so there is nothing really special about this item. It also looks like the cover was issued in several different shades (Red, Pale Green, Black and a chocolate shade.