Sometimes you can tell by looking at the design, but the only sure way is to use a catalog of one sort or another. I use Scott's but there are others, some really inexpensive.
Thanks laswabbie I do have that book so I will check it out I have more foreign stamps then usa I do have more usa ones then I thought tho on the pixie ones im only missing a few I have the 1/2 cent,1 1/2cent,2cent,3,4,5,6,7,8,9,10,12,15,20,25,30 and 50
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