So far you have posted about hitting the jackpot (not) with more stamps than a life long knowledgeable collector would blindly find in a lifetime. Paper, perforations, colors, printings, edges, dates, type of use, plate position all are variables which determine which stamp you have. Until you understand those subjects just assume you have the cheap variety.
This is going to sound patronizing, but we have to know the answer.
Have you figured out what a watermark is yet? Do you understand the import of the two images PostmasterGS posted above?
More to the point, do you see how the watermark on your stamp matches the first image in PostmasterGS' post? If not, that's okay. It can take some practice.
Understanding watermarks and perforations are going to be critical to evaluating what you have. There are other variables, too, of course, but those are fundamental.
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