@first4, it looks to me like this coin has some dried glue on the surface. The impressed pattern suggests that someone glued together two of these 50 cent pieces together and then popped them apart.
You should be able to remove it with your fingernail.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
are you sure it not just some adhesive? (possibly another coins stuck on to it was remove left an impression of clear glue) probably PMD, however yours does have a tiny bottom lip Cud on the queen :D
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