Tell me what I'm seeing please...just extremely worn 5c dies?

Honestly I love these kind of moments...makes me feel like an absolute beginner!
I don't search a lot of nickels. I just did about 20 rolls and found some fun stuff I'll put in the CRH thread shortly...
But first...What am I looking at here? Please and thank you!
They don't appear to have much actual wear, but are nearly mirror like with extreme luster.
The '66 showed up first and I though maybe it was an extremely worn die SMS nickel...
Then the other 2 showed up but I don't believe they come from SMS years.
Teachable moment for me....
1966 - 2 slightly different angles
1968 D - 2 slightly different angels
**1978 D **
All 3 together
Coins are Neato!
"If it's a penny for your thoughts and you put in your two cents worth, then someone...somewhere...is making a penny." - Steven Wright
Comments
Most likely weaker strikes, or perhaps a little thinner planchet. Worn dies typically have odd patterns that appear on the devices and backgrounds, including some types of doubling appearance.
Likely a combo of stressed dies/weak strikes.
That "look" is very common on many Jeffersons in the 60s.
The indicia around the rims appears sharp, while the images look weak, which - IMO - would indicate a die issue. Worn or weak strikes. Cheers, RickO
Die erosion from overused dies is what's causing the rather "coarse" luster. Some are additionally weakly struck. The 78-D shows rather severe die fatigue, even spreading out the lettering near the rim. Be aware that dies are not necessarily removed and replaced in pairs, although current practice may be to do so.
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