I was going through some of my stamps I had bagged and stored for what seems like forever; and I came across an envelope of very old El Salvador stamps I had quite forgotten about it seems. Could one of my fellow members recommend some resources for identifying the actual year of issue and postal purpose for different types of stamps from this country? I was amazed to remember that I have many that are mint with original gum.
Any ideas for research resources would be helpful.
Thanks.
