Came in L-size and postcard sizes but official website only lists reservation numbers for L-sizes.
7-11 Seven Prints can only be printed from printers located within Japanese 7-11 convenience stores, like printing a photo. Each set had its own printing time period. Print reservation numbers were the number you typed into the system to select the bromide, it is not the actual name of the card and is likely not on the bromide itself. See the link to the official site for images.
Size: L-size, postcard size