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Message:: [QUOTE="eddiespin, post: 2156648, member: 4920"]It's not an exact, groove-for-grove match. Look at it, however. It's about the same width. The lines in it are about the same. Remember, it's a 1917-D. Whatever that is that struck your 1978-D, sure, it may be expected to have looked a little different 61 years before. When identifying these struck-throughs, typically, they're "struck-through wire," "struck-through fiber," "struck-through debris," vague descriptions like that. You never hear what they were used for. Why were they at the Mint, what was their purpose? Nobody gets into that. I'm showing this to suggest this thing that struck your coin is something that's been around in the Mint for quite some time, and has a pretty standardized shape and size. Think of this like a piece of the puzzle in trying to figure out what this is and what its purpose was. Why go to this extreme? Heck, it's cool to know.  [ATTACH=full]414586[/ATTACH][/QUOTE]