tonyzz

Yes, I agree with you all, definitely PMD to me as well, I don't really see when this could have happened during manufacture process. I was more wondering if this kind of oddity was already seen here in the past and what could explain it. What it looks like to me (but I'm definitely not an expert at all as you can guess), is the same 'droplet' shape generated by a welding pen. But is there any kind of PMD behavior where someone would do such modification/repair to a coin? @Fenntucky Mike I thought about this too, that the picture could create a kind of visual illusion and that it's in fact a drill cavity on the reverse creating a protuberance on the obverse. But when doing the coin alignement experiment, we can see the two anomalies are not perfectly aligned, what could eliminate this theory isn't it? @J P M oh interesting! In in this case this could definitely be drill mark. Is there any resource showing exact coin sides alignement somewhere by any chance? @Greenstang Actually this is how I saw them based on the picture, it seems raised to me, but it seems based on previous answer that I may be wrong and it's a visual illusion Thank you all for your replies, really helpful!

Hello, lately I found this photo of an old US penny taken by my uncle from his collection (this penny is most likely lost, so I only have these pictures unfortunately). I was wondering if anyone had an idea of what could have caused these both sides copper 'droplet' (if it is). When analyzing coin alignement, we can see that droplets are on the same location, but not perfectly align however. Thanks in advance! Tony