We have seen this coin before--you were worried then about the odd seam at the upper right. If the coin bothers you this much, you might want to submit to to someone to look over in person.
Thank you very much for your answer! No it doesn't really bother me anything. I am 22 years old less than a year on the hobby and trying to understand and learn as much as I can and always be as sure as I can of what i have on my
collection. I also always value an opinion from people who are veterans on the hobby! Also can you please explain what is a encrustation on coin? Is it normal for a
tetradrachm from that period to have it and also is there any bronze on the
alloy of these tetradrachms or are they completely silver? Also I have found an other
tetradrachm on the internet with very similar look on the encrustations so for you to have a better look on how they look they look like the photo below in much lesser amount.