Definitely Danny. We don't even know that it's a Y. Could be a partial stamp of another letter, a non-latin letter, an image, or even remnants of a stamp that was only partially scrubbed. It may even be inadvertent damage or a camera artifact that perhaps isn't a stamp at all.
As a aside, you've got a set of eyes and a mind that's able to take a set of data and formulate an educated opinion. That's what's important here! "Extensive knowledge" isn't what makes a collector right. The ability to articulate your position and then show hard data that agrees with it is especially important. Even more important is the ability to accept when you're wrong and adjust your theory accordingly in the face of data that doesn't fit your narrative.
Many people simply can't do this and we get people with large collections and even larger egos that dictate gospel w/o having a shred of evidence to support their position. This is the worst of all worlds as these types of collectors tend to stifle any and all dissent, opinions, and comments from the regular joe collectors that have a set of eyes and a mind that can bring pieces of data to the table and help the entire collecting community acquire knowledge. It saddens me.