While digging through boxes and boxes of covers at a stamp show, have you ever stopped and wonder what stamps can be seen together on a cover. Quite often postal historians will look for the solo use of a stamp; but sometimes combination can be rare and interesting as well. Some stamps are frequently seen on the same cover, for example a 2¢ and 3¢ stamp paying the 5¢ UPU foreign letter rate. Other stamps rarely sit beside each other (a 5¢ and 6¢).

Below is a table of combinations in my collection. I have not included the high denomination stamps because I don't have any in my collection (yet).