Hello CubanStampIssues:
I don't want to discourage you, but I doubt this stamp will have any "market value" because of poor condition. This is even more true if there is indeed a tear or crease running from the top of the stamp through the "A" -- as stallzer mentioned. But either way, the first step is to verify you have properly identified its catalog number.
While you're waiting for other (more knowledgeable) members to weigh in on this issue, let me encourage you to post a message in the Introductions forum. It will give everyone a chance to get to know you and learn more about your collecting interests.
I assume by your choice of nicknames you collect Cuba -- there have been several threads here recently about Cuban stamps. If you haven't seen them already, use the SEARCH button at top of the page to find them.
Finally, I'll say

KirkS