The die that struck your coin has a partial Grease Fill on the affected devices. Sometimes grease into the die chamber and they wipe the die down. with a cloth. Depending how the grease is spread into the die it can do three things: Full or partial blockage. This prevents the metal to flow into the deeper devices. When the grease if there, either the devices are fully blocked, part blocked or angled from more grease being in just one area.
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