I don't have enough experience with these mm. I would like to say its an rpm but I think in 87 they stopped punching them by hand then it would be a dd or it could be zinc rot I just don't know. I didn't find anything on coppercoins or lcr maybe an expert can help.
Quote: Lol I didn't even think of that being a gas bubble thanks again everyone
Sure you did...zinc rot and gas bubbles are pretty much the same..when something rots, it creates gas...then a bubble...then it bursts..and you have zinc rot
Another cause of zinc rot is split plating. The plating develops a hole and the zinc starts to break down. Just not a pretty site when this happens and just gets worse with age.
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